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Cook Strait

Cook Strait (Māori: Te Moana-o-Raukawa) is a strait separating New Zealand's North Island from the South Island, connecting the Tasman Sea to the west with the South Pacific Ocean to the east.^[1]^[2] It measures 22 kilometres at its narrowest point between Cape Terawhiti on the North Island and Perano Head on Arapaoa Island, with an average depth of 128 metres, though depths exceed 300 metres in the central Narrows Basin and plunge to over 2,500 metres in associated submarine canyons.^[3]^[2] The strait spans approximately 40 kilometres in length and lies within the Roaring Forties wind belt, resulting in frequent strong westerly winds and tidal currents reaching speeds of 1.5–2 metres per second, creating turbulent conditions notorious for challenging navigation.^[4]^[2] Named after Captain James Cook, who first navigated the strait in 1770 during his exploration of New Zealand's coasts, it holds significant cultural importance to Māori as a traditional pathway for migration, trade, and resource gathering.^[1] Geologically, Cook Strait is shaped by active tectonics along the boundary of the Pacific and Australian plates, featuring fault lines such as the Marlborough Fault System and a complex submarine canyon network that incises the seafloor, facilitating sediment transport and marine biodiversity.^[3]^[2] The region's dynamic environment supports diverse ecosystems, including habitats for marine mammals like whales and dolphins, while its position makes it a critical corridor for commercial shipping and inter-island ferry services between Wellington and Picton, carrying over one million passengers and hundreds of thousands of vehicles annually.^[5]^[6] Despite its importance, Cook Strait's hazardous conditions—exacerbated by unpredictable weather, steep waves, and strong rips—have led to numerous maritime incidents, prompting specialized training endorsements for seafarers and ongoing research into tidal energy potential.^[7]^[4] The strait also attracts adventurers, notably open-water swimmers who attempt its 22-kilometre crossing, a feat first achieved in 1962 and now governed by strict protocols due to the risks involved.^[8]

History and Cultural Significance

Māori Perspectives and Legends

In Māori tradition, Cook Strait is known as Te Moana-o-Raukawa (Raukawa or Raukawa Moana), referring to the "sea of Raukawa," a name derived from a native plant with fragrant leaves that grows along its shores. This waterway holds profound cultural and spiritual significance as a sacred passage central to ancestral narratives, facilitating trade, migration routes between the North and South Islands, and spiritual connections to the sea god Tangaroa.^[1]^[9] A pivotal legend recounts the discovery of the strait by the navigator Kupe around the 10th century, during his voyage from Hawaiki aboard the waka Matahourua. Pursuing the giant octopus Te Wheke-a-Muturangi, which had been stealing fish from his lines, Kupe chased the creature across the ocean, culminating in a fierce battle in the waters of Raukawa Moana near Tory Channel, where he slew it with a whalebone patu. This epic pursuit not only established the strait as a key navigational pathway in Polynesian voyaging but also embedded it in oral histories as a place of heroic deeds and separation of the islands, with landmarks like Te Whekenui Bay commemorating the event.^[10]^[11] Traditional Māori travel across Raukawa Moana involved waka voyages for inter-tribal connections, fishing, and resource gathering, as preserved in oral histories that describe crossings for kai moana (seafood) such as shellfish and fish, essential for sustenance and trade. These journeys, often undertaken in double-hulled waka equipped with sails and navigated by stars, currents, and landmarks, fostered alliances and exchanges between iwi on either side of the strait, despite its treacherous tides.^[1]^[10] The strait plays a vital role in iwi identities, particularly for Ngāti Kuia and Rangitāne, descendants of the Kurahaupō waka that arrived in the region around the 14th century, establishing territories in areas like Pelorus Sound and Wairau. For these iwi, Raukawa Moana serves as both a natural boundary defining traditional rohe (tribal areas) and a meeting place for cultural and resource-based interactions, reinforcing whakapapa (genealogy) tied to its waters.^[12]

European Exploration and Naming

The first European contact with the region of Cook Strait occurred during the voyage of Dutch explorer Abel Tasman in December 1642. Tasman, commanding the ships Heemskerck and Zeehaen, sailed northward along the west coast of what is now New Zealand's South Island after anchoring in Golden Bay (then named Murderers' Bay following a fatal encounter with Māori). Strong tidal currents indicated an opening to the east, but persistent poor visibility and adverse weather led him to misidentify the feature as a large bay rather than a strait, which he charted as Zeehaen's Bight on his map Nova Zeelandia.^[1] Nearly 128 years later, British navigator James Cook definitively identified and transited the strait during his first Pacific voyage aboard HMS Endeavour. In late January 1770, after anchoring in Ship Cove within Queen Charlotte Sound on the South Island, Cook led an expedition to a nearby hill (now known as Cooks Lookout on Arapawa Island), from where he observed the narrow passage connecting the Tasman Sea to the Pacific Ocean and separating New Zealand's two principal islands. He then sailed through the strait from south to north between 15 and 20 February 1770, producing detailed charts that accurately depicted its turbulent currents and intervening islands such as Kapiti. Although Cook did not explicitly name the strait after himself in his journal, it became known as Cook Strait in recognition of his exploration, likely through the influence of expedition botanist Joseph Banks.^[1]^[13]^[14] Subsequent European voyages further validated Cook's findings. In November 1791, British explorer George Vancouver, on his North Pacific expedition aboard HMS Discovery, anchored in Dusky Sound on the South Island's southwest coast before navigating northward through the strait, confirming its role as the key waterway dividing the North and South Islands amid challenging winds and currents. Vancouver's observations reinforced the strait's strategic importance for maritime passage between the islands.^[15] In the early 19th century, systematic hydrographic surveys by British naval officers refined the mapping of Cook Strait, addressing navigational hazards for increasing colonial traffic. Officers from vessels such as HMS Alligator and later survey ships measured key dimensions, determining the minimum width at approximately 22 kilometers between Cape Terawhiti on the North Island and Perano Head on Arapaoa Island, while documenting depths averaging 128 meters and peak tidal flows exceeding 4 knots. These efforts, building on Cook's foundational charts, established the strait as a vital but perilous corridor for shipping.^[3]

Historical Settlements and Events

In the early 19th century, European whaling activities flourished around Cook Strait, with shore-based stations established on both the North and South Island coasts to exploit the migratory southern right whales passing through the area. One of the earliest stations was set up around 1827 at Te Awaiti on Arapawa Island in the Marlborough Sounds by John Guard, marking the beginning of organized whaling operations that attracted European settlers and employed Māori laborers from local iwi such as Ngāti Koata and Rangitāne.^[16] By the 1830s, additional stations dotted the strait’s shores, including sites at Cloudy Bay and Port Underwood, where integrated crews of Pākehā whalers and Māori workers processed whale oil and bone, fostering early intercultural exchanges but also introducing muskets that altered traditional power dynamics.^[17] During the 1820s, Ngāti Toa leader Te Rauparaha orchestrated migrations and raids across Cook Strait, utilizing large waka taua to expand his people’s influence from Kāwhia to the Kapiti Coast and beyond. In approximately 1827, Te Rauparaha led an initial war party across the strait to the Wairau region, capturing several Rangitāne pā and securing a foothold on the South Island, followed by larger invasions that displaced or allied with local tribes.^[18] These crossings were pivotal in the Musket Wars (c. 1807–1842), a series of intertribal conflicts exacerbated by the introduction of firearms through trade with Europeans, resulting in significant population displacements and conquests around the strait, including the subjugation of Ngāti Apa and Rangitāne territories.^[19] European colonization intensified in the 1840s, with the New Zealand Company establishing Wellington as a major port on the strait’s northern shore in January 1840, drawing hundreds of settlers amid ambitious land acquisition plans. The signing of the Treaty of Waitangi on February 6, 1840, between the British Crown and over 500 Māori rangatira promised protection of Māori land rights while granting the Crown pre-emptive purchase authority, yet it sparked disputes in Cook Strait regions as the Company’s prior sales of land in Wellington and Nelson conflicted with Māori ownership claims.^[20] These tensions culminated in events like the 1843 Wairau Affray near the strait, where settlers clashed with Ngāti Toa over contested land, highlighting the treaty’s uneven implementation and leading to prolonged legal and armed conflicts over iwi territories on both shores.^[21] Meanwhile, the first organized European settlers arrived in Nelson on February 1, 1842, via the ship Fifeshire, establishing a planned community that relied on the strait for trade and communication, though early years were marked by land shortages and Māori-settler negotiations.^[22] A notable natural phenomenon during this era was Pelorus Jack, a Risso’s dolphin first observed in 1888 guiding ships through the hazardous French Pass channel in the Marlborough Sounds at the strait’s southeastern entrance. For over two decades until around 1912, Jack routinely escorted vessels, particularly those of the Union Steam Ship Company, from Pelorus Sound to the open strait, earning fame and legal protection under a 1904 Order in Council that made him New Zealand’s first individually safeguarded marine mammal after an attempted shooting.^[23] His presence symbolized the strait’s perilous navigation and became a cultural icon for mariners and settlers. As global tensions escalated, World War II prompted the construction of coastal fortifications along Cook Strait’s shores to defend against potential naval threats, with batteries installed at strategic sites like Fort Ballance near Wellington and gun emplacements on Blumine Island in the Marlborough Sounds. From 1940 onward, these defenses included searchlights, anti-aircraft guns, and radar stations manned by New Zealand and Allied forces, reflecting fears of Japanese incursions following the 1941 Pearl Harbor attack, though no major engagements occurred in the strait.^[24] By 1945, over a dozen such sites ringed the waterway, underscoring its role as a vital southern gateway to New Zealand’s key ports.^[25]

Geography and Geology

Location and Physical Features

Cook Strait lies between New Zealand's North Island and South Island, specifically separating the Kapiti Coast and Wellington region to the north from the Marlborough Sounds and Cloudy Bay area to the south. It serves as a critical waterway connecting the Tasman Sea on its northwestern side to the South Pacific Ocean on its southeastern side. The strait spans approximately 40 km in an east-west orientation, encompassing surrounding coastal features such as Palliser Bay on the North Island's southeast flank and Tasman Bay adjacent to the South Island's northwest.^[26]^[27]^[28] At its narrowest point, between Cape Terawhiti on the North Island and Perano Head on Arapaoa Island in the Marlborough Sounds, the strait measures 22 km across, providing the shortest sea passage between the two main islands. The coastal topography is characterized by steep cliffs rising sharply from the water on both sides, interspersed with bays and inlets that add complexity to the shoreline. On the southern side, the Marlborough Sounds form a intricate network of drowned river valleys, created through tectonic subsidence that submerged ancient fluvial systems, resulting in a labyrinth of channels, islands, and sheltered waterways.^[27]^[26]^[29]^[30] Several notable islands punctuate the strait, including The Brothers—a group comprising North Brother and South Brother islets—located off the northeastern tip of Arapaoa Island, as well as Entry Island (also known as Kapiti Island) near the northern entrance. These islands, particularly The Brothers and Kapiti, function as protected bird sanctuaries, hosting diverse seabird populations and supporting conservation efforts for native wildlife. The overall landscape reflects the broader tectonic activity that has shaped the region, with the strait's formation linked to the submergence of a prehistoric land bridge due to ongoing plate boundary movements.^[31]^[32]^[33]

Geological Formation and Seismicity

Cook Strait's modern configuration resulted from post-Ice Age sea level rise approximately 7,000 years ago, which submerged a river valley connecting the North and South Islands of New Zealand.^[34] During the Last Glacial Maximum around 20,000 years ago, global sea levels were about 120 meters lower than present, exposing the continental shelf and forming a land bridge across what is now the strait.^[35] As glaciers melted, rising seas progressively inundated the valley, with initial breaching occurring around 15,000–16,000 years before present, though the current bathymetric profile stabilized with the sea level rise culminating near 7,000 years ago.^[36]^[35] The strait has an average depth of 128 meters and reaches a maximum depth exceeding 300 meters, contributing to its dynamic tidal regime.^[3] A prominent feature is the Cook Strait Canyon, a large, multi-branched mega-canyon system extending southward from the strait's eastern margin into the Hikurangi subduction zone; this shelf-incising structure spans about 1,800 square kilometers and reaches depths of up to 2,700 meters, shaped by both erosional processes and ongoing tectonic activity.^[37] The canyon's development reflects the interplay of post-glacial sedimentation and tectonic deformation along New Zealand's active margin.^[2] Geologically, Cook Strait lies at the transition of New Zealand's plate boundary, where the Pacific Plate subducts obliquely beneath the Australian Plate at a rate of about 42 millimeters per year, transitioning from continental collision in the south to subduction in the north.^[3] This position places the strait within the highly active Marlborough Fault System, a network of dextral strike-slip faults including the Wairarapa Fault, which accommodates much of the plate motion through the region.^[38] The area's seismicity is elevated due to this tectonic setting, with frequent earthquakes resulting from fault slip and associated crustal deformation. Significant seismic events in Cook Strait's history include the 1855 Wairarapa earthquake, a magnitude 8.2 event centered near the Wairarapa Fault that caused widespread uplift and subsidence around the strait, along with a tsunami reaching heights of up to 10–11 meters in parts of Cook Strait.^[39] More recently, the 2013 Seddon earthquake (magnitude 6.5) and the subsequent Lake Grassmere earthquake (magnitude 6.6), both nucleating in the Cook Strait region, generated minor tsunamis with waves up to 1 meter high and minor damage to infrastructure.^[40]^[41] In February 2023, a magnitude 6.3 earthquake struck the Cook Strait region, causing strong shaking felt across central New Zealand but no significant tsunami or major damage.^[42] These events underscore the strait's vulnerability to moderate-to-large earthquakes, which can propagate tsunamis across its narrow confines and impact surrounding coastal areas.^[43]

Oceanography and Climate

Tidal and Current Dynamics

The tides in Cook Strait are predominantly semidiurnal, dominated by the M₂ constituent, with typical spring tidal ranges of 1 to 1.5 meters along the strait.^[44] This pattern arises from the broader amphidromic system encircling New Zealand's coastline, where the tidal wave propagates counterclockwise around the islands, resulting in significant phase variations across the region.^[45] In Cook Strait specifically, the M₂ tidal phase differs by approximately 150 degrees (equivalent to about five hours) between the western entrance near Tasman Bay and the eastern exit toward the Pacific Ocean, creating a near-standing wave configuration that drives bidirectional tidal flows.^[44] This phase lag amplifies water movement within the narrow channel, generating peak tidal currents of up to 3.4 meters per second (about 6.6 knots) during spring tides, particularly in constricted areas like the Karori Rip near Cape Terawhiti.^[46] The strong flows are further influenced by residual circulation from the South Taranaki Bight, where a counterclockwise gyre contributes to enhanced velocities as water enters the strait via the d'Urville Current.^[47] Near Cape Terawhiti, the combination of tidal amplification and topography produces complex turbulent features, including eddies and steep standing waves in the rip, which can reach speeds of 2 to 3 meters per second under typical conditions.^[48] Oceanographic studies, including those by Ron Heath in the late 1970s and subsequent NIWA modeling efforts, have elucidated these dynamics through current meter data and numerical simulations. Heath's analysis of tidal constituents highlighted the semidiurnal dominance and phase-driven rectification leading to residual east-west flows of 0.1 to 0.2 meters per second.^[49] NIWA's high-resolution models reveal persistent eddies along the strait's flanks and localized upwelling zones, especially during ebb tides, where vertical mixing reaches depths of 50 meters and supports nutrient entrainment from the seafloor.^[47] These features contribute to the strait's overall volume flux, with the M₂ tidal component alone accounting for an amplitude of 4.68 Sverdrups.^[50]

Climate Influences and Environmental Changes

Cook Strait experiences predominant westerly winds, which are channeled through the narrow passage between the North and South Islands of New Zealand, often intensifying due to topographic effects. These westerlies frequently interact with the Southern Alps to form barrier jets, leading to strong southerly winds in the region, particularly during frontal passages. Average wind speeds in the strait typically range from 15 to 20 knots, with gusts reaching up to 50 knots during intense events, contributing to challenging navigation conditions.^[51]^[52] Climate change is exerting significant influences on Cook Strait's marine environment, with sea surface temperatures rising by approximately 1°C since 1900, driven by global ocean warming trends. This warming has led to more frequent and intense marine heatwaves, particularly in the northern Cook Strait, where persistent warm water anomalies have been observed in recent years. In 2023 and 2024, New Zealand experienced record-high sea surface temperatures, exacerbating marine heatwaves in the region.^[53]^[54]^[55]^[56] Additionally, increased storm intensity associated with a warming atmosphere has amplified wave heights, heightening risks of coastal erosion along the strait’s margins, such as in the Marlborough Sounds and Wellington region.^[53]^[54]^[55] Ocean acidification, resulting from elevated atmospheric CO2 absorption, has caused a pH drop of about 0.1 units in New Zealand's coastal waters since pre-industrial times, affecting the strait’s chemistry. Sea level rise, observed at around 2.2 mm per year in the Wellington area since the early 1900s, is projected to reach 0.3 to 1 meter by 2100, potentially amplifying tidal ranges and exacerbating inundation risks in low-lying coastal areas. Long-term monitoring at the Baring Head atmospheric station, operational since 1972, provides critical data on rising CO2 levels—now averaging over 423 ppm annually (as of 2024)—serving as a key proxy for regional climate trends and greenhouse gas influences on the strait.^[57]^[58]^[59]^[60]

Marine Ecology

Biodiversity and Key Species

Cook Strait hosts a rich array of marine biodiversity, particularly among cetaceans, which utilize the strait as a critical migration corridor and foraging habitat due to its position between the North and South Islands. Hector's dolphins (Cephalorhynchus hectori), an endangered subspecies, maintain a distinct subpopulation of approximately 230 individuals (as of 2017) in the Cloudy/Clifford Bay area adjacent to the strait, with smaller groups in nearby sounds, where they inhabit shallow coastal waters for feeding and calving.^[61]^[62] Southern right whales (Eubalaena australis), classified as vulnerable, regularly pass through the region during their seasonal migrations between Antarctic feeding grounds and subtropical breeding areas, as evidenced by historical whaling records and modern satellite tracking data. Orca pods (Orcinus orca) are frequently observed in the strait, often in family groups hunting fish and other marine mammals in the dynamic waters. Sperm whales (Physeter macrocephalus), also vulnerable, exploit the deep eastern portions of Cook Strait for feeding on deep-sea prey, with acoustic monitoring confirming their presence year-round and along migration routes.^[5] Seabirds and pinnipeds contribute significantly to the strait's ecological diversity, with species adapted to the nutrient-rich upwellings and island habitats. New Zealand fur seals (Arctocephalus forsteri) form breeding colonies at sites like Cape Palliser and Ward Beach–Needles Point along the strait's margins, hauling out on rocky shores and islands for resting and pup-rearing, while foraging extensively in surrounding waters for fish and squid. Little blue penguins (Eudyptula minor), the world's smallest penguin species, nest in coastal burrows and rocky crevices around the strait, particularly in sheltered bays, where they dive for small fish and squid during nocturnal foraging trips. Several albatross species frequent Cook Strait's surface waters, including the white-capped albatross (Thalassarche steadi), which scavenges near fishing vessels, the black-browed albatross (Thalassarche melanophris), often seen offshore, and wandering albatross (Diomedea exulans), which glide over deeper channels; these seabirds benefit from the strait's productivity but face incidental interactions with fisheries.^[63]^[64]^[65]^[66]^[67]^[68] Fish populations in Cook Strait reflect its role as a transitional zone between subtropical and subantarctic waters, supporting both game and commercial species. Hoki (Macruronus novaezelandiae), a key deepwater fish, spawns in the strait from late June to mid-September, drawing large seasonal aggregations that form the basis of New Zealand's largest commercial fishery, with peak activity in July and August. Kahawai (Arripis trutta), a schooling predator, inhabits the strait's northern reaches up to 150 meters depth, preying on smaller fish and crustaceans while serving as a popular recreational target. Snapper (Chrysophrys auratus) occupy shallower rocky reefs and sandy bottoms around the strait, particularly in coastal embayments, where they graze on shellfish and crustaceans. Albacore tuna (Thunnus alalunga), a migratory pelagic species, transits through the region during warmer months, pursued by both commercial longliners and sport fishers for its high-speed surface runs.^[69]^[70] Invertebrate communities thrive in Cook Strait's subtidal habitats, with kelp forests acting as biodiversity hotspots that shelter diverse assemblages. Paua (Haliotis iris), an iconic abalone, clings to rocky substrates in the strait's intertidal and subtidal zones, grazing on algae and supporting both customary and commercial harvests, with enhancement efforts like seeding juvenile stock south of Tory Channel to bolster populations. Giant squid (Architeuthis dux), elusive deep-sea cephalopods, inhabit the strait's offshore depths, occasionally washing ashore on beaches as evidenced by historical strandings between 1879 and 1887, and serving as primary prey for sperm whales. Dense kelp forests, dominated by Ecklonia radiata, extend across rocky reefs and provide three-dimensional structure for over 180 associated fish and invertebrate species, including sponges, starfish, crabs, and sea urchins (kina), fostering high productivity amid the strait's strong currents that influence species distribution.^[71]^[72]^[65]

Conservation Efforts and Threats

Cook Strait's marine environment benefits from several adjacent protected areas designed to preserve biodiversity and mitigate human impacts. The Kapiti Marine Reserve, established in 1992, encompasses 2,167 hectares around Kapiti Island and the surrounding seabed, prohibiting fishing and extraction to safeguard habitats for fish, seals, and dolphins.^[73] Similarly, the Clifford and Cloudy Bay Marine Mammal Sanctuary, designated in 2008, covers coastal waters south of the strait to protect endangered Hector's dolphins from activities like seismic surveying and seabed mining.^[74] These areas contribute to broader ecosystem resilience by restricting commercial pressures in key foraging and breeding zones. Human-induced threats significantly challenge the strait's ecological integrity. Overfishing, particularly bycatch in the hoki trawl fishery, has led to notable mortality of New Zealand fur seals, with estimates indicating 100–250 affected annually in Cook Strait waters (2012–2021 mean: 124).^[64] Plastic pollution disperses rapidly via the strait's strong currents, as demonstrated by oceanographic models simulating debris trajectories from coastal drop points, exacerbating ingestion risks for marine species like dolphins. Vessel strikes pose a direct hazard to marine mammals in this busy shipping corridor, where high ferry and commercial traffic increases collision probabilities for migratory whales and resident dolphins.^[62] Additionally, habitat loss from sedimentation, driven by land runoff in adjacent Marlborough Sounds, smothers benthic communities and reduces suitable areas for key species.^[75] Conservation initiatives involve collaborative monitoring and protection strategies. The National Institute of Water and Atmospheric Research (NIWA) deploys acoustic moorings to track cetacean distributions and vocalizations in Cook Strait, aiding in the identification of high-use areas for species like blue whales and beaked whales.^[5] The Department of Conservation (DOC) focuses on seal protection through bycatch mitigation in fisheries and population assessments, emphasizing reduced incidental captures in the hoki fishery.^[76] On an international level, the Marlborough Sounds and Cook Strait Important Marine Mammal Area (IMMA), recognized in 2018, promotes global standards for whale and dolphin habitat conservation by highlighting threats and advocating for reduced disturbances.^[62] Recent concerns center on biofouling from ship hulls and invasive species introductions via ballast water, given the strait's role as a trans-Tasman shipping route; these vectors have facilitated non-native species establishment in New Zealand waters, potentially altering local food webs.^[77] Efforts to address these include national biosecurity protocols under the Ministry for Primary Industries, which enforce ballast water management to minimize risks in high-traffic zones like Cook Strait.

Transportation

Ferry Services

Commercial ferry services across Cook Strait primarily operate between Wellington on the North Island and Picton on the South Island, providing essential connectivity for passengers, vehicles, and freight. The two main operators are Interislander, managed by KiwiRail, and Bluebridge, operated by StraitNZ, which together facilitate the majority of crossings. These services are critical to New Zealand's economy, transporting approximately 1 million passengers and over 5 million tonnes of freight annually, including both road and rail cargo that supports national supply chains.^[6]^[78] Interislander and Bluebridge each offer 3 to 5 sailings daily in each direction, with typical journey durations of about 3.5 hours, depending on weather conditions. The ferries accommodate cars, trucks, and passengers, with Interislander vessels also handling rail wagons to enable seamless inter-island rail freight movement. In 2024 and 2025, services achieved high reliability during summer peak periods, with minimal disruptions reported, though weather-related cancellations occurred around 150 times over the year, averaging three per week, primarily due to strong winds and swells in the strait.^[79]^[80]^[81] A significant fleet development in 2025 was the retirement of Interislander’s rail-enabled ferry Aratere on August 18, following 26 years of service, to allow for port infrastructure upgrades in Picton. This vessel, which had carried passengers and freight since 1999, was sold for recycling in India. To modernize operations, KiwiRail has contracted Guangzhou Shipyard International in China to build two new 200-meter rail-enabled ferries, capable of accommodating 1,500 passengers each, scheduled to enter service in 2029 as part of a broader replacement project estimated at NZ$1.4 billion, including vessel construction and terminal enhancements. These new vessels will feature hybrid electric propulsion systems for reduced emissions, building on earlier electrification initiatives announced for the fleet.^[82]^[83]^[84]^[85]^[86]

Aviation and Other Modes

The first powered flight across Cook Strait occurred on 25 August 1920, when Captain Euan Dickson piloted an Avro 504K biplane from Christchurch to Upper Hutt (near Wellington), with stops at Kaikōura and Blenheim, taking a total flying time of about 4 hours 40 minutes, marking a significant milestone in New Zealand aviation history.^[87] This crossing overcame challenging winds and demonstrated the feasibility of aerial travel over the strait, paving the way for regular services that began in the 1930s. Early commercial operations, such as those by Cook Strait Airways, connected Wellington with Nelson and Blenheim using de Havilland Dragon Rapides, reducing travel time compared to sea voyages. Today, Air New Zealand provides frequent domestic flights across Cook Strait from Wellington International Airport to key South Island destinations, including Blenheim and Nelson, with typical durations of 25 to 30 minutes for the shorter routes. These services operate multiple daily frequencies—up to 11 to Blenheim and 14 to Nelson—using turboprop and jet aircraft like the ATR 72 and Airbus A320, accommodating both passengers and limited freight.^[88] In contrast, ferry services remain the primary mode for vehicles and rail freight but offer slower crossings of about three hours. In 2025, Air New Zealand initiated trials of electric aircraft in partnership with BETA Technologies, deploying the ALIA CX300—a battery-electric, fixed-wing model capable of carrying up to five passengers—for short regional hops, including potential Cook Strait routes.^[89] The aircraft, which arrived in New Zealand in October 2025, completed initial test flights from Hamilton and Tauranga, with plans for Wellington-based operations to evaluate zero-emission feasibility amid the strait's variable weather.^[90] These trials aim to decarbonize short-haul aviation, building on the ALIA's 280-nautical-mile range and rapid 60-minute recharge.^[91] Beyond aviation, coastal shipping serves as an alternative mode for freight transport, circumventing direct Cook Strait crossings via longer routes such as Whanganui to Nelson, which could reduce reliance on the strait amid seismic risks.^[92] Proposals for high-speed catamarans have been discussed to enhance these bypass options, offering faster coastal freight delivery—potentially halving times compared to traditional vessels—though past Cook Strait catamaran services faced operational challenges like high fuel costs and weather sensitivity.^[93] Air links across Cook Strait play a vital economic role, particularly in supporting tourism by enabling quick access to Marlborough wine regions and Tasman Bay attractions, with Wellington Airport handling over 4.5 million domestic passengers annually, a substantial portion of which involves South Island crossings.^[88] This connectivity facilitates seasonal peaks, contributing to New Zealand's $40 billion tourism sector, though exact strait-specific figures remain integrated within broader domestic traffic data.

Maritime Incidents and Safety

Cook Strait has been the site of numerous maritime disasters due to its challenging conditions, with over 1,000 shipwrecks recorded in the area since 1800.^[94] Among the most tragic incidents was the sinking of the inter-island ferry SS Penguin on 12 February 1909, when the vessel struck rocks near Cape Terawhiti in heavy seas and gale-force winds, resulting in 75 deaths out of 105 people on board.^[95] Nearly six decades later, on 10 April 1968, the TEV Wahine encountered a severe storm while approaching Wellington Harbour, grounding on Barrett Reef and capsizing, which claimed 53 lives from the 734 passengers and crew. More recently, the Interislander ferry Aratere experienced multiple groundings, including one on 21 June 2024 north of Picton during a voyage from Picton to Wellington, caused by a failure in the steering control system that the crew could not override, though no injuries occurred among the 47 people on board.^[96] These accidents are often attributed to the strait’s environmental hazards, including rogue waves, strong tidal currents, and persistent fog that reduce visibility.^[94] Rogue waves, which can reach up to 15 meters or more in height, arise from the interaction of swells and opposing winds in the narrow channel, while tidal currents reaching speeds of up to 6 knots exacerbate navigational difficulties by creating unpredictable eddies. Fog, particularly in the cooler months, forms due to the mixing of warm air over cold currents, contributing to collisions and groundings.^[94] To mitigate these risks, New Zealand authorities have implemented several safety measures, including Vessel Traffic Services (VTS) radar systems operated by Ports of Wellington and other regional ports to monitor vessel movements and provide real-time guidance. MetService, the national meteorological service, delivers specialized weather forecasting for Cook Strait crossings, issuing warnings for swells over 4 meters and wind speeds exceeding 30 knots that could impact ferry operations. Additionally, mandatory pilotage is required for vessels over 500 gross tons in adjacent sounds like Queen Charlotte Sound and Tory Channel to assist with navigation through confined waters influenced by tidal dynamics. In 2025, severe weather events continued to pose challenges, with multiple ferry sailings cancelled in August due to strong southerly winds and swells up to 5 meters, affecting both Interislander and Bluebridge services without resulting in fatalities but causing significant economic disruptions through delays and rebookings for thousands of passengers.^[97]

Fixed Link Proposals

Proposals for a fixed link across Cook Strait date back to the early 20th century, when New Zealand Premier Richard Seddon advocated for a bridge to connect the North and South Islands, envisioning it as a means to unify the nation economically and infrastructurally.^[98] This idea gained renewed attention in the mid-20th century amid discussions on improving inter-island transport, though engineering assessments at the time, including a 1958 government inquiry, ultimately favored roll-on/roll-off rail ferries over a permanent structure due to practical constraints.^[99] In the 2010s, conceptual studies re-emerged for a submerged tunnel, estimated at approximately 25-30 kilometers in length to navigate the seabed topography, with projected costs ranging from NZ$40 billion to NZ$50 billion.^[100]^[101] These proposals were largely dismissed following evaluations that highlighted insurmountable challenges, including the strait's high seismicity along the Pacific-Australian plate boundary, extreme tidal currents exceeding 4 knots, and water depths reaching up to 300 meters, which would complicate construction and maintenance.^[102]^[103] More recent assessments in 2024 and 2025, led by the New Zealand Ministry of Transport, have reviewed options for resilient inter-island connections as part of broader infrastructure planning, emphasizing the need for reliable freight and passenger links amid vulnerabilities exposed by ferry disruptions.^[104] While favoring enhanced ferry services as the primary solution, these evaluations have explored hybrid approaches, such as combining improved maritime operations with potential fixed elements like utility-integrated causeways, though full-scale bridges or tunnels remain unviable due to ongoing environmental concerns, including disruptions to marine ecosystems and migratory species.^[105]^[106] Existing ferry infrastructure continues to serve as the interim backbone for transport across the strait.^[107]

Infrastructure and Energy

Submarine Cables

The first submarine cable across Cook Strait was a telegraph line laid in 1866, connecting Lyall Bay in Wellington on the North Island to Whites Bay near Blenheim on the South Island, enabling instant communication between the islands for the first time.^[108] This simple copper cable, approximately 40 km long, faced significant challenges during installation due to strong currents causing the cable to snap, requiring a second attempt and use of recycled cable to complete the connection.^[108]^[109] Modern fiber-optic submarine cables for telecommunications and internet connectivity were introduced across Cook Strait in the 1990s. In 1991, five new submarine cables, including fiber-optic for telecommunications, were laid, followed by two more in 1992, often bundled with power infrastructure and forming a critical backbone for New Zealand’s digital connectivity, carrying vast amounts of internet traffic between the islands.^[110] In 2020, a new 40 km telecommunications cable was laid from Oteranga Bay on the North Island to Fighting Bay on the South Island at a cost of up to $15 million to replace end-of-life systems, designed to withstand the strait's tidal movements.^[111] The primary submarine power infrastructure consists of high-voltage direct current (HVDC) cables installed under the HVDC Inter-Island link, which began operations in 1965 with Pole 1 to transmit hydroelectricity from the energy-rich South Island to the North Island.^[112] Pole 2 followed in 1992, with each pole rated at approximately 500 MW capacity, enabling a total transfer of up to 1,000 MW and supporting national grid stability by balancing supply across the islands.^[113] These three undersea cables, spanning about 40 km, are armored to withstand the strait’s conditions but have faced outages from faults and environmental stresses.^[114] In September 2025, Transpower submitted a $1.1 billion proposal for the first stage of the HVDC link upgrade, including replacement of the three aging submarine cables by 2031, addition of a fourth cable, and upgrades to converter stations and control systems to boost overall capacity to 1,400 MW and enhance grid resilience.^[115] Laying and maintaining these cables presents significant challenges due to Cook Strait’s powerful tidal currents, which can reach speeds of 4-6 knots and cause seabed scour, necessitating specialized vessels for precise installation and burial in water depths up to 200 m where feasible.^[111] In rocky areas, cables are often surface-laid with protective armoring rather than buried, and a designated Cable Protection Zone restricts activities like anchoring to minimize damage.^[116]

Tidal Energy Potential

Cook Strait's tidal streams offer substantial renewable energy potential, estimated at up to 12 GW, driven by peak current speeds exceeding 2.5 m/s in areas suitable for turbine deployment.^[117] These strong, predictable flows, funneled by the strait’s narrow geography, position it among New Zealand's premier sites for tidal stream generation, with resource densities reaching over 5,000 W/m² at select locations.^[118] A key proposed project was the 2008 Neptune Power initiative, which received resource consent for a 1 MW prototype horizontal-axis tidal turbine trial off Sinclair Head, intended to test feasibility and environmental effects but ultimately not constructed.^[119] Feasibility studies by the National Institute of Water and Atmospheric Research (NIWA) have evaluated tidal stream viability, focusing on optimization for economic and environmental sustainability in the strait.^[120] The primary technology for harnessing this potential involves seabed-anchored horizontal-axis turbines, akin to European designs like the UK's SeaGen, which feature three-bladed rotors to capture bidirectional flows.^[118] Environmental impact assessments are integral, addressing risks such as collision with marine mammals, including dolphins and whales that traverse the strait.^[118] Significant barriers include high development costs, estimated at around NZ$500 million for a 100 MW farm, alongside challenges from marine mammal interactions and the need for high-voltage direct current (HVDC) integration to connect remote generation to the national grid.^[121] Existing submarine power cables across the strait facilitate potential transmission pathways.^[118]

Recreation and Challenges

Swimming Crossings

The first verified modern crossing of Cook Strait was achieved by Barrie Devenport on 20 November 1962, when he swam 22 km from the North Island to the South Island in 11 hours and 20 minutes, following numerous prior failed attempts by others since the 1920s.^[122] Devenport's success marked the beginning of documented solo swims across the strait, a challenging 20-30 km route depending on currents, governed by strict rules to ensure safety and ratification. Since then, approximately 207 successful solo crossings have been recorded as of April 2025, with swimmers facing a success rate of about one in six due to the strait's unpredictable conditions.^[123] New Zealand long-distance swimmer Philip Rush holds the record for the most crossings, completing eight between 1980 and 1988, including double and triple relays. His fastest solo time was 7 hours 51 minutes on 13 March 1984, from the North Island to the South Island, showcasing exceptional endurance in tidal flows that can extend the effective distance.^[123] The youngest successful swimmer is Aditya Santosh Raut, an 11-year-old from India, who crossed from the North Island to the South Island on 20 February 2005 in 9 hours and 9 minutes.^[124] Swimmers encounter severe challenges, including cold water temperatures of 12-15°C that risk hypothermia without wetsuits, which are prohibited under standard rules. Strong tidal currents reaching up to 5 knots can push swimmers off course or add hours to the journey, while lion's mane jellyfish stings are common, causing pain and inflammation. Shark encounters occur in about one in six attempts, necessitating vigilant shark watches from support boats equipped with spotters and electronic deterrents.^[125] All attempts are organized through the New Zealand Open Water Swimming Association (NZOWSA), which ratifies swims and enforces protocols such as non-wetsuit swims, no propulsion aids, and mandatory support vessels for navigation and emergency response. Permits are required from Maritime New Zealand to coordinate with shipping traffic in the busy strait, ensuring compliance with safety bylaws during the optimal February-April window.^[123]^[126]

Other Activities and Risks

Cook Strait supports a variety of recreational activities centered on its rich marine environment, including wildlife viewing, fishing, scuba diving, and kayaking. Wildlife viewing tours, particularly for marine mammals and seabirds, are popular, with operators offering cruises from ports like Picton and Wellington to observe species such as dusky dolphins, bottlenose dolphins, Hector's dolphins, New Zealand fur seals, and migratory humpback whales during winter months (June to September).^[127]^[128] These tours often highlight the strait’s role as a key habitat and migration corridor, where participants may also spot albatross with wingspans exceeding 3 meters and other seabirds like white-fronted terns.^[127] Recreational fishing is another prominent activity, with charters targeting species such as snapper in shallower waters and deep-sea fish like hapuku, bass, and bluenose in the outer reaches. Access points include Wellington Harbour and the Marlborough Sounds, where anglers use boats to reach productive sites, adhering to regulations that include size limits, bag limits, and closed areas to protect stocks.^[129] Scuba diving opportunities exist around wrecks and reefs in the Marlborough Sounds, influenced by Cook Strait's currents, where divers encounter diverse marine life including fish schools and kelp forests, though conditions can vary due to water flow from the strait.^[130] Sea kayaking is pursued in sheltered areas near the strait, such as the sounds, with guided tours providing access to coastal scenery and wildlife, but full crossings are rare and reserved for experienced paddlers.^[131] These activities carry significant risks due to Cook Strait's dynamic conditions, including strong tidal currents reaching up to 4 knots and frequent tidal rips, particularly between Cape Terawhiti and Sinclair Head, which can capsize small vessels or kayaks.^[131] Northerly winds often exceed 30 knots near Karori Rock and Sinclair Head, creating rough seas and reduced visibility that demand vigilant weather monitoring via VHF radio on Channel 14.^[131] For boating and fishing, reliable engines, lifejackets, and communication devices are essential, as is avoiding crossings during adverse forecasts; divers and kayakers face additional hazards from unpredictable swells and cold water temperatures averaging 13–15°C.^[131]^[132] Encounters with large ferries pose collision risks in busy channels, underscoring the need for all participants to carry safety gear and check tide charts beforehand.^[133]

References

[1]
Cook Strait | Toitū Te Whenua - Land Information New Zealand
The strait is shown as a large bay on the 'rugged line' of New Zealand's west coast. Tasman did suspect there was access to another sea, however, due to the ...<|control11|><|separator|>
[2]
Geomorphic response of submarine canyons to tectonic activity
Oct 1, 2014 · In this paper we analyze high-resolution geophysical data and imagery from the Cook Strait ... The strait narrows to 22 km width at the central ...
[3]
Marlborough-Cook Strait faults - Earth Sciences New Zealand
With strong tidal flows, a minimum width of 22 km and an average depth of 128 m, the Cook Strait waters obscure our ability to clearly see how these fault ...
[4]
Background | Earth Sciences New Zealand - NIWA
Cook Strait is one of the great straits of the world. Although changes in tidal height are modest, it turns out they are high on one side of the side of the ...
[5]
Acoustic Monitoring of whales and dolphins in New Zealand's Cook ...
The sounds of whales and dolphins rarely seen in New Zealand waters have been recorded in a pioneering underwater sound project.
[6]
[PDF] Required knowledge for Cook Strait endorsement | Maritime NZ
Cook Strait is known locally and internationally as one of the most rugged stretches of water in the world, with strong winds and strong tidal effects that ...
[7]
Scientists set to delve into the secrets of the Cook Strait mega-canyon
Cook Strait Canyon starts just 10 kilometres off the coast in 50 metre water depths and plunges to 3000 metres south of Cape Palliser. The canyon, one of the ...
[8]
Te Ara o Raukawa Moana | Deep South Challenge
Raukawa Moana, the Cook Strait, is of the highest cultural and spiritual significance to Ngāti Toa Rangatira. Our seafaring and waka histories and ...
[9]
Kupe - The Discoverer | Toitū Te Whenua
Here is an account of the story of Kupe made from the two traditions of Raukawa Moana and Te Tai Tokerau. Kupe sailed from Hawaiki on a voyage of discovery ...
[10]
[PDF] Maori, whales and "whaling" an ongoing relationship
Included in this elite group of navigators were men such as Kupe, who discovered New Zealand, probably in the 10th century,Toi and his grandson Whatonga ...
[11]
[PDF] The Northern South Island - Waitangi Tribunal
Jun 25, 1995 · Its purpose was to establish whether a prima facie case of Treaty breach could be demonstrated for iwi with an interest in particular Railcorp ...
[12]
James Cook - NZ History
Mar 1, 2019 · ... Cook initiated the first Māori-European interaction since Abel Tasman's brief encounter in 1642. In his remarkably accurate charting of New ...
[13]
January - March 1770 | Captain Cook Society
Cook was to visit Dusky Sound during his Second Voyage. The next day, Cook “pass'd a small narrow opening in the land where there appear'd to be a very snug ...
[14]
George Vancouver (1757-1798) Part 3: The Voyage 1791-1792
On 2 November, 1791, Vancouver anchored his ships in Dusky Sound on the southwest coast of South Island, New Zealand. Having been there with Cook in Resolution ...
[15]
Te Kahuoterangi Whaling Station - Heritage New Zealand
One of the first shore whaling establishment in the Cook Strait area was John Guard's station established around 1827 at Te Awaiti, in the Marlborough Sounds.
[16]
Whaling | Te Ara Encyclopedia of New Zealand
For the first 40 years of the 19th century whaling was the most significant economic activity for Europeans in New Zealand – with the hunt first for sperm ...
[17]
Te Rauparaha | Dictionary of New Zealand Biography | Te Ara
About 1827 Te Rauparaha took a war party across Cook Strait to Wairau, where several Rangitāne pā were taken. A year or so later a larger invasion fleet ...
[18]
Musket Wars - NZ History
Oct 19, 2021 · Between 1818 and the early 1830s, thousands of Māori were killed in a series of conflicts often called the Musket Wars.Missing: Cook Strait
[19]
Te Tiriti o Waitangi – the Treaty of Waitangi
In 1839 the company prepared to buy land on either side of Te Moana-o-Raukawa (Cook Strait), and dispatched ships there carrying several hundred settlers.Missing: sacred waterway
[20]
History of New Zealand, 1769–1914
Sep 9, 2025 · The Māori response to this visit is less well-known, with the exception of fragments of oral tradition that were recorded in the 19th century.
[21]
Remembering all of Nelson's history - Stuff
Jan 28, 2022 · 180 years ago on the first of February, the first 150 European settlers came to Whakatū to start a new town and a new life.
[22]
The story of Pelorus Jack | Dolphins
First noticed in 1888 when he joined a steamer bound for Nelson, Pelorus Jack spent the next 24 years escorting boats from Pelorus Sound to treacherous French ...Missing: Strait | Show results with:Strait
[23]
Picton and World War II - The Prow
World War II has left its mark on Picton and the Marlborough Sounds area, in memorials, gun emplacements, buildings, a reserve, as well as in the memories ...
[24]
Defending the Coast: New Zealand's WWII Coastal Fortifications
Sep 26, 2025 · Accessible only by boat, Blumine Island houses WWII gun emplacements and barracks built to defend the Cook Strait. Today, it's a fascinating ...
[25]
cook strait - The Sea Floor - Te Ara Encyclopedia of New Zealand
Cook Strait is the stretch of water separating the North and South Islands of New Zealand. It connects the South Pacific Ocean and the Tasman Sea.
[26]
Cook Strait | NZ History
The strait is named after James Cook, the first European commander to sail through it, in 1770. In Māori it has the name Raukawa or Raukawa Moana. Raukawa may ...
[27]
Residual Flows in Cook Strait, a Large Tidally Dominated Strait in
At its narrowest point it is 22 km across, with 210- and 350-m average and maximum depths, respectively (Fig. 1). Its fast-flowing tidal currents have been ...Missing: width survey
[28]
Drowned valleys | Geology - Te Ara Encyclopedia of New Zealand
Drowned valleys occur when land slowly sinks, causing river valleys to be submerged by the sea, as seen in the subsiding Marlborough Sounds.
[29]
Marlborough Sounds Complex
Tectonic activity has had a significant influence on the Marlborough Sounds with regional subsidence leading to the drowning of the original river valleys, ...
[30]
Arapawa Island to Port Underwood
May 9, 2011 · The Brothers are a wildlife sanctuary. Tory Channel. The principal channel between the Marlborough Sounds and Cook Strait, and the route taken ...
[31]
Brothers Island - Maritime NZ
Brothers Island is New Zealand's only rock station, built in 1877, and is now a restricted wildlife sanctuary. It was the last manned lighthouse and is ...Missing: Entry bird
[32]
Formation | Te Ara Encyclopedia of New Zealand
Cook Strait appears to have been formed by a flooding by the sea of a continuous land ridge in Opoitian times, late in the Tertiary Period.
[33]
Cook Strait Facts for Kids
Oct 17, 2025 · Cook Strait (called Te Moana-o-Raukawa in Māori) is a famous strait in New Zealand. It separates the North Island from the South Island.
[34]
Currents of change: the ocean flow in a changing world - NIWA
Dec 4, 2001 · Part of the former moves through Cook Strait as the D'Urville Current. The Southland Current travels anticlockwise around the bottom of New ...
[35]
Tidal and sedimentary response to the Late Quaternary closure and ...
The land bridge was breached and Cook Strait was formed about 15,000 years B.P. (approximately −75 m). Both the Narrows and breach were subject to high bottom ...<|control11|><|separator|>
[36]
Cook Strait Canyon system, New Zealand - ScienceDirect.com
The Cook Strait Canyon system, located between the North and South islands of New Zealand, is a large (1800 km 2 ), multi-branching, shelf-indenting canyon on ...
[37]
Structure and paleoearthquake records of active submarine faults ...
Dec 22, 2010 · [9] The Cook Strait shelf and canyons are underlain by three major sedimentary basins, each about 15–20 km wide.<|control11|><|separator|>
[38]
M 8.2 Wairarapa Tue, Jan 23 1855 - GeoNet
The M 8.2 Wairarapa earthquake on Jan 23, 1855, was the most severe since 1840, generating a large tsunami, with the greatest height of 10-11m at Te Kopi.
[39]
M 6.5 Cook Strait Sun, Jul 21 2013 - GeoNet
Jul 21, 2013 · M 6.5 Cook Strait Sun, Jul 21 2013. This earthquake followed two earlier shakes of magnitude 5.7 and 5.8 in the previous two days.
[40]
Marlborough earthquakes – 2013 and 2016
Sep 29, 2017 · At 5.09 p.m. on Sunday 21 July 2013, a magnitude 6.5 earthquake rocked central New Zealand, causing minor damage. The earthquake was centred ...
[41]
[PDF] Review of Tsunami Hazard in New Zealand (2013 Update)
This report has been prepared by the Institute of Geological and. Nuclear Sciences Limited (GNS Science) exclusively for and under.<|control11|><|separator|>
[42]
Ocean tides around New Zealand - Taylor & Francis Online
The phase difference across Cook Strait is c. 150° which leads to large currents and interesting dynamics. A tidal wave propagates in from either end of the ...
[43]
[PDF] JOURNAL OF MARINE RESEARCH - EliScholar
However, the M2 tides in Cook Strait are small, a consequence of the 120° phase change in this component through the Strait. (Heath, in press), and the relative ...
[44]
Observed and modelled tidal currents in the New Zealand region
Aug 10, 2025 · Cook Strait is subject to some of the strongest currents in the world, reaching flows as high as 3.4 m s −1 during spring tides (Heath, 1978; ...
[45]
Residual Flows in Cook Strait, a Large Tidally Dominated Strait
This western northward flow had a seasonal bias, appearing only in the summer–autumn period. The observations also show persistent temperature stratification on ...
[46]
Tidal energy resource complexity in a large strait: The Karori Rip ...
The Cook Strait is highly favoured by proximity to energy transmission infrastructure. A mainly semi-diurnal tide in New Zealand generates tidal elevation ...
[47]
Generation of the M 4 tide in Cook Strait, New Zealand
Nov 1, 1983 · Heath, R. A., 1978: Semi-diurnal tides in Cook Strait, New Zealand. J. mar. Freshw. Res.12, 87–97. Article Google Scholar. Heath, R. A., 1980a: ...
[48]
A modelling synthesis of the volume flux through Cook Strait
Cook Strait is the body of water separating the North and South Islands of Aotearoa New Zealand (Figure 1). At its narrowest, it is 22 km wide (Figure 2A).Missing: width historical
[49]
Coastal winds | New Zealand Geographic
Typically, the wind 50 km out to sea is 15–20 knots from the south-east, while close to the coast it is only 5–10 knots from the south-west. This “damming” of ...Missing: average | Show results with:average
[50]
Damaging Southerly Winds Caused by Barrier Jets in the Cook ...
For this case, wind speeds in Cook Strait were stronger than those observed or forecast elsewhere in the storm. Even though wind speeds of this intensity are ...
[51]
Climate Change Indicators: Sea Surface Temperature | US EPA
Sea surface temperature increased during the 20th century and continues to rise. From 1901 through 2023, temperature rose at an average rate of 0.14°F per ...
[52]
Marlborough Sounds reach record-breaking sea temperatures - Stuff
Nov 22, 2023 · Persistent marine heatwaves in Cook Strait are thought to be behind record-breaking sea temperatures in the Marlborough Sounds.
[53]
1. Effects of climate change on the ocean around New Zealand
Oct 8, 2025 · Projections indicate sea-surface temperatures in New Zealand's oceanic regions will warm 1.0 to 1.5 degrees Celsius by 2050 and 1.0 to 3.0 ...
[54]
Investigating ocean acidification | Earth Sciences New Zealand - NIWA
Globally the oceans' average pH is currently 8.1, which is 0.1 lower than it was 250 years ago. This may not sound significant, but the pH scale is logarithmic, ...Missing: Cook Strait
[55]
[PDF] Wellington Region climate change projections and impacts - NIWA
Wellington has experienced ~2.2 mm/yr of sea-level rise since the 1900s. • Global sea-level rise will approx. be between 0.28 and 0.98m by 2100, compared with.
[56]
Baring Head Atmospheric Research Station - NIWA
Atmospheric carbon dioxide (CO2) is measured continuously at Baring Head, providing the longest running record of this type in the Southern hemisphere.
[57]
Marlborough Sounds and Cook Strait IMMA
Hector's dolphin – Cephalorhynchus hectori. Criterion A. Humpback whale – Megaptera novaeangliae. Criterion A; C (3). Killer whale – Orcinus orca. Criterion C ( ...Missing: cetaceans | Show results with:cetaceans
[58]
Fur seal population estimate and bycatch analysis, Cook Strait hoki ...
Only two breeding colonies around Cook Strait region were confirmed: Mātakitaki-a-Kupe / Cape Palliser and Ward Beach – Needles Point. A total of 2,016 hoki ...
[59]
Habitat: Taputeranga Marine Reserve report card
Many albatross and petrel species pass through Cook Strait and a colony of New Zealand fur seals/kekeno spends the winter months at Red Rocks/Pariwhero just ...
[60]
White-capped mollymawk | Toroa - New Zealand Birds Online
The white-capped mollymawk is a familiar albatross of coastal waters from Hawke Bay south, scavenging around commercial and recreational fishing vessels.
[61]
Black-browed mollymawk | Toroa - New Zealand Birds Online
... albatross' species. About 70% breed at the Falkland Islands (Islas Malvinas) ... Birds are often seen in Cook Strait and off Kaikoura Peninsula. After ...
[62]
Wandering albatross | Toroa - New Zealand Birds Online
They are normally found offshore, but can be seen in southern New Zealand waters and northwards to Cook Strait, and in lower numbers further north. Care is ...Species Information · Breeding · Wandering Albatross | Toroa<|separator|>
[63]
Fishery - Hoki (including key bycatch stocks)
A second major spawning fishery occurs in Cook Strait where the season runs from late-June to mid-September peaking in July and August. Small catches of ...
[64]
Kahawai Extra Territorial (200 mile limit) (KAHET) - Overview
Kahawai is mostly found north of Cook Strait at depths to 150 m. They feed on other fish, crustaceans and copepods.<|control11|><|separator|>
[65]
Cook Strait seeding grows paua stocks - Stuff
Apr 26, 2012 · Nearly 100,000 juvenile paua have been seeded south of Tory Channel in Cook Strait as the commercial industry continues to replenish stocks.
[66]
Hunting the giant squid | New Zealand Geographic
... Cook Strait or at Kaikoura. Since sperm whales are major predators on giant squids, expedition leader Clive Roper of the Smithsonian is interested in using ...
[67]
Kapiti Marine Reserve - Department of Conservation
Kapiti Marine Reserve is popular for its abundant sea life including blue moki, kingfish, seals and dolphins. It's also home for some top dive spots.Missing: Cook Strait
[68]
Clifford and Cloudy Bay Marine Mammal Sanctuary
The Clifford and Cloudy Bay Marine Mammal Sanctuary is used to manage seabed mining and seismic surveying activities which may threaten Hector's dolphins and ...
[69]
[PDF] The Marlborough Coastal Marine Area: Environmental issues and ...
May 28, 2021 · This report, prepared for Marlborough District Council, discusses environmental issues and scientific information needs for the Marlborough ...
[70]
NZ fur seal CSP reports - Department of Conservation
This is the final report for POP2021-06 Fur seal population estimate and bycatch analysis, Cook Strait hoki fishery. Published August 2023. NZ fur seal ...<|separator|>
[71]
[PDF] Marine Biofouling and Invasive Species
Of the 205 species introduced via shipping – and for which sufficient information was available – 39% were introduced by hull-fouling, 31% via ballast water, ...<|control11|><|separator|>
[72]
[PDF] Interislander Ferries and Terminals - Ministry of Transport
Jun 3, 2021 · The Cook Strait crossing is a strategic national asset, extending State Highway One and the Main. Trunk Railway between the North and South ...<|control11|><|separator|>
[73]
Half-billion-dollar contract to build two new Interislander ferries signed
Jun 30, 2021 · “The Cook Strait ferries are crucial to our economy, carrying 5.5 million tonnes of freight and 850,000 passengers between the North and ...
[74]
Ferry timetable - Interislander - Cook Strait Ferries
Interislander offers a range of convenient sailing times everyday across Cook Strait. See our departure times.
[75]
Bluebridge Ferry Timetable
Bluebridge Cook Strait Ferries travel between Wellington and Picton 50 times a week. Check out our latest timetable to see our current sailing times.
[76]
Interislander ferry cancelled 150 times in the last year - Stuff
Apr 11, 2025 · Since April 2024, sailings of the Cook Strait ferry have been cancelled 150 times – an average of three times a week.Missing: electrification trials
[77]
Aratere Retirement - Interislander - Cook Strait Ferries
Aug 18, 2025 · Aratere Officially retired on August 18, 2025. The final sailing for Aratere was the 11:00am departure from Picton on that day.
[78]
Aratere set to end its days at recycling shipyard in India ... - RNZ
Oct 10, 2025 · KiwiRail has agreed to sell the Interislander ferry Aratere to a buyer, which will deliver it to a specialist recycling shipyard in India.
[79]
New Cook Strait ferries to be built by large Chinese shipbuilding ...
Oct 13, 2025 · The two new 200m ferries will accommodate 1500 passengers, and include both road and rail decks.Missing: cost | Show results with:cost
[80]
Government announces shipbuilder for new Interislander ferries
Oct 13, 2025 · Guangzhou Shipyard International will build the two new Interislander ferries, set to arrive in four years' time, the Government has ...
[81]
Siemens selected for Interislander ferries' electric propulsion system
May 23, 2022 · KiwiRail has selected Siemens Energy to supply the integrated electric propulsion system (EPS) for the Interislander's new rail-enabled, more environmentally ...
[82]
Wigram Air Base - Christchurch City Libraries
Some impressive feats were achieved, such as the first air crossing of Cook Strait in August 1920. Captain Euan Dickson of the Canterbury Aviation Company ...Missing: across | Show results with:across
[83]
[PDF] Annual Review 2025 - Wellington Airport
Growth has been much stronger for international travel with a 37% increase in seats operated to Brisbane with both Qantas and Air New Zealand operating larger ...
[84]
Air New Zealand Starts Flight Trials With Beta's CX300 Electric ...
Oct 20, 2025 · October 20, 2025. Air New Zealand has begun a series of test flights with Beta Technologies' Alia CX300 electric aircraft. On October 17, the ...
[85]
Air New Zealand launches its first electric aircraft - The Driven
Oct 21, 2025 · The Alia CX300 arrived in New Zealand last week and was blessed at a sunrise ceremony in Tauranga. The aircraft was then flown to Hamilton ...
[86]
Aircraft - BETA Technologies
ALIA VTOL Vertical takeoff & landing all-electric aircraft. Wingspan. 50 ft. Cargo Capacity. 200 ft³. Passenger Capacity. 5 Passengers. Charge Time. 1 hr.The BETA Timeline · Defense · Charge · BatteryMissing: Zealand | Show results with:Zealand<|control11|><|separator|>
[87]
[PDF] a comparative study of coastal shipping, rail and road modes
This is attributed to the disproportionate cost of the 92km crossing of. Cook Strait by roll-on roll-off ferry. ... Strait Shipping two ferries to compete.
[88]
Coastal shipping: a re-berth? | Engineering NZ
Jun 6, 2022 · Coastal shipping is more cost-effective, emissions efficient and sustainable than other modes of freight transport, says Clive.
[89]
Shipwrecks - Te Ara Encyclopedia of New Zealand
Because of its unreliable weather, very strong and variable currents and often violent seas, Cook Strait has always been a hazardous place for ships, ...
[90]
SS Penguin wrecked in Cook Strait - NZ History
Oct 6, 2020 · The Picton-Wellington ferry SS Penguin struck rocks in Cook Strait and sank in heavy seas off a rugged, isolated coast.Missing: major TEV
[91]
Charges filed by Maritime NZ against KiwiRail following ...
Charges filed by Maritime NZ against KiwiRail following investigation into 2024 grounding of Interislander ferry north of Picton. 18 June 2025.
[92]
Cook Strait ferry sailings cancelled, road snowfall warnings as ... - RNZ
Aug 19, 2025 · 19 Aug 2025. Cook Strait ferry sailings cancelled, road snowfall warnings as winter weather plays havoc. 1:11 pm on 19 August 2025. Share this.
[93]
Is it time for a Cook Strait bridge or tunnel? - Stuff
Feb 6, 2018 · ... strait averages almost twice that depth at 128m. The Chunnel cost ... Strait, which is much deeper than Cook with a maximum depth of 200m.<|separator|>
[94]
New Zealand Railways | New Zealand Ship and Marine Society
Apr 23, 2010 · In 1958 a Cook Strait Transport Inquiry Committee issued a report recommending a roll on/roll off rail and road ferry. The Union Company ...
[95]
What are the options now for Cook Strait crossing planners? - Stuff
Dec 14, 2023 · In 2018, a Stuff investigation found it would cost about $40 billion to tunnel the Cook Strait. Leave it to business? The Government could ...
[96]
The incredible 18-mile tunnel that could link two islands and cost ...
Jan 19, 2025 · The Cook Strait tunnel would be approximately 25-30 kilometres, drastically reducing the three-to-four-hour sailing time between the islands.
[97]
Wild weather halted ferries between New Zealand's main islands ...
Jan 7, 2025 · He estimated a cost for a tunnel of 50 billion New Zealand dollars ($28 billion), comparable in today's terms to the price of the undersea ...
[98]
Should we build a bridge or tunnel across Cook Strait?
Mar 4, 2024 · A bridge or a road tunnel across Cook Strait would be infeasible, but actually a rail tunnel carrying passenger and freight trains and shuttles for cars and ...
[99]
Assessment of the Long-Term Requirements for a Resilient Cook ...
Mar 20, 2024 · The Ministry is undertaking an assessment of the long-term requirements for a resilient connection across Cook Strait to connect people and enable freight ...
[100]
Ministers got second Cook Strait report shortly before ferry grounding
Jun 27, 2024 · The Ministry of Transport has finished work to identify future options for a resilient Cook Strait connection, including considering the<|separator|>
[101]
[PDF] Background-on-the-study-of-the-long-term-resilience-of-Cook-Strait ...
When the advisory group was launched, the Ministry was also tasked with preparing a separate assessment of the requirements for a resilient Cook Strait.Missing: review | Show results with:review
[102]
New ferries will ensure safe, resilient connection | Beehive.govt.nz
Dec 11, 2024 · The Government is establishing a new company to procure two new ferries to ensure a safe, reliable and commercially viable ferry service.Missing: review | Show results with:review
[103]
Telegraph line laid across Cook Strait - NZ History
A simple copper telegraph cable was laid on the sea floor from Whites Bay, north of Blenheim, to Lyall Bay on Wellington's south coast.Missing: fiber optic
[104]
1879 Cook ... - History of the Atlantic Cable & Submarine Telegraphy
Jan 27, 2008 · In 1866 the first cable across the Cook Strait, which separates the north and south islands of New Zealand, was laid on the second attempt.
[105]
History of the Atlantic Cable & Submarine Telegraphy
Jan 20, 2021 · The first attempt to link the two islands across the Cook Strait took place in 1866 when W.T. Henley's Telegraph Works manufactured the ...
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NZ undersea cables in Whites Bay, Marlborough and ... - The Prow
The first Cook Strait communications cable, between Lyall Bay in Wellington and Pukatea/White's Bay 2 in Marlborough, was completed on 26 August, 1866.
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Cook Strait Cable Protection Zone (CPZ) - Transpower
There is a Cable Protection Zone (CPZ) in the Cook Strait where Transpower has both its high-voltage submarine cables and fibre-optic telecommunications cables ...Missing: fiber | Show results with:fiber
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HVDC link upgrade programme - Transpower
Sep 9, 2025 · Transpower proposes to replace the ageing electricity cables that cross the Cook Strait at the end of the decade.Missing: fixed hybrid
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HVDC History in New Zealand - Hitachi Energy
... cables across the Cook Strait. The new thyristor-based HVDC Pole 2 was commissioned and operated alongside the ASEA link, increasing capacity to 1040 MW.Missing: 1 | Show results with:1
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Cook Strait Power Cable Failure | Beehive.govt.nz
Apr 29, 2009 · Pole 2 is a relatively new asset, built in 1992. The dated Pole 1 has limited capacity but is relied on to transfer power between the two ...
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Transpower proposes up to $1.4 billion investment in Cook Strait ...
May 7, 2025 · Transpower proposes up to $1.4 billion to replace undersea cables, add a fourth cable, upgrade termination stations, and the control system, ...
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New Telecommunications Cable for Cook Strait - Transpower
Feb 24, 2020 · Length of cable needed 40 km. Cable details – 60mm diameter, weighing ~13 kilograms per metre. For more information please contact: Geoff ...
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[PDF] About Submarine Power Cables
for submarine power and telecommunications cables across Cook Strait within the. Cable Protection Zone (CPZ) red = < 100m deep blue = >1000m deep. CPZ. Cook.
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[PDF] COOK STRAIT TIDAL POWER POTENTIAL & PLANS
The Cook Strait in NZ is an exceptional location due to having tidal flows that are among the strongest in the world. Reasons for this are tidal resonance. Page ...<|control11|><|separator|>
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[PDF] Development of Marine Energy in New Zealand - Electricity Authority
Jun 30, 2008 · The Neptune Power proposal to establish a tidal stream project in Cook Strait ... On April 10 2008 Neptune Power was granted a non-notified ...
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Green light for Cook Strait energy generator trial - NZ Herald
Apr 14, 2008 · Neptune is confident of the economics of the Cook Strait project, and will use the experimental turbine to study effects on marine life and ...
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Tidal energy optimisation | Earth Sciences New Zealand - NIWA
The aim of this research is to enhance the economic and environmental viability of an emerging renewable energy – tidal stream power.Missing: feasibility | Show results with:feasibility
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Estimating the power potential of tidal currents and the impact of ...
Cook Strait NZ has an estimated potential of 15 GW, while the entrance channel to Kaipara Harbour has a potential between 110 ... Tidal energy resource assessment ...
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First woman swims Cook Strait | NZ History
Casey Glover swam the strait from north to south on 13 April 2008 in a record 4 hours 37 minutes. Eleven-year-old Aditya Raut became the youngest conqueror of ...
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Cook Strait | LongSwims Database
The Cook Strait lies between the North Island and South Island of New Zealand, connecting the Tasman Sea with the South Pacific Ocean. The strait is 22 km ...
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Cook Strait Marathon Swim
Recognised Swims ; 12, Philip Rush, New Zealand ; 13, Mohammad El-Meseery, Egypt ; 14, Rhonda Smidt, New Zealand ; 15, Belinda Shields, New Zealand ...
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Aditya Santosh Raut | LongSwims Database
Solo Swims ; 2005 Feb 20, Cook Strait, North Island to South Island ; 2006 Aug 5, Catalina Channel, Catalina Island to Mainland ; 2009 Aug 8, Strait of Gibraltar ...
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Cook Strait Record Swimming Attempt Comes Up Short - SwimSwam
Jan 19, 2016 · ... record-attempt swim across New Zealand's Cook Strait. ... the first modern swimmer to cross it was New Zealander Barrie Devenport in 1962.
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Operating limits - Maritime NZ
New certificates and endorsements ... allowing surveyors to assign an inshore limit to an individual vessel for Cook Strait (only for vessels of at least 12m and ...
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Safari at Sea: Cook Strait Wildlife - Interislander
The largest seabird in the world, the albatross can have a wingspan of over three metres. This allows them to glide far more gracefully than smaller gulls, ...
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Whale Island Tours in New Zealand | Experience The Great Migration
Rating 4.9 · Review by E-Ko CustomerExperience the annual whale migration in the calm waters of the Queen Charlotte Sound. You'll also visit the historic Perano Whale Station. Book Now!Help Save The Endangered... · About The Tour · What To Expect
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100 of New Zealand's best fishing locations! - The Fishing Website
Access to Cook Strait and deep water fishing in the outer Sounds. a) Keneperu Sound: top snapper fishing in summer from boats or the shore. Mussel farms ...
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6 Best Dive Spots in New Zealand - SSI
Marlborough Sound is home to many wrecks to explore from voyagers who fell victim to rough waters in Cook Strait. There's plenty of sites and marine life to be ...
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A quick guide to Cook Strait - Greater Wellington Regional Council
Dec 16, 2021 · In a strong northerly along the Hutt motorway in the northern part of the harbour is the best place, few waves but you can get very strong gusts ...Missing: standing | Show results with:standing
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Diving New Zealand - The best scuba spots in Aotearoa
Jan 19, 2023 · Be aware, the weather and currents are unpredictable there as the water travels through Cook Strait, which can create unusual conditions.<|separator|>
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[PDF] 15NZ328 Wellington Harbour Risk Assessment 31-08-18
Aug 31, 2018 · Near miss / close quarters between a Cook Strait Ferry, Tug and Pilot Boat. 2013. Passenger Cruise Vessel sustained minor fire in an ...