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Nemo 33

Nemo 33 is an indoor scuba diving and aquatic center located in Uccle, Brussels, Belgium, renowned for housing one of the world's deepest swimming pools at a maximum depth of 33 meters (108 feet).^[1]^[2] Opened in 2004, the facility was designed by Belgian civil engineer and diving enthusiast John Beernaerts to create a controlled, tropical-like environment for divers, using 2.5 million liters of purified spring water maintained at a constant 33°C (91°F) without chlorine.^[3]^[2]^[4] The center's innovative architecture includes multiple depth levels—ranging from 1.5 meters to 33 meters—along with simulated underwater caves, platforms, and high-visibility conditions that mimic natural diving sites, making it ideal for training, recreation, and certification courses year-round.^[1]^[2] Upon its opening, Nemo 33 held the Guinness World Record for the deepest indoor pool, attracting divers from around the globe before being surpassed by facilities like Italy's Y-40 in 2014.^[2]^[5] Beyond diving, Nemo 33 serves as a versatile venue for events, accommodating up to 1,200 people across spaces from 40 to 400 square meters, including seminars, banquets, and team-building activities integrated with its aquatic features.^[6] It supports various programs through affiliated training centers, such as those from Scuba Schools International (SSI), offering courses for beginners to advanced divers, as well as freediving sessions and equipment rentals via its on-site dive shop.^[1]^[7] The facility's emphasis on safety, accessibility by public transport, and all-weather operation has made it a landmark in European diving culture.^[8]^[9]

History

Development and Construction

The development of Nemo 33 originated in the early 1990s when Belgian diving expert and civil engineer John Beernaerts sketched the initial concept on a table mat during dinner with a friend, envisioning a groundbreaking indoor diving facility.^[10] Motivated by his two decades of global diving experiences and the absence of a reliable, year-round venue for safe scuba training in Europe's temperate climate, Beernaerts sought to address the limitations of traditional outdoor or shallow pool diving.^[11] Beernaerts designed Nemo 33 as a multipurpose complex from the outset, prioritizing professional diver instruction, recreational exploration, and opportunities for film production to simulate underwater environments without the risks of open-water dives.^[2] The project emphasized sustainability and accessibility, incorporating non-chlorinated spring water and controlled conditions to make advanced diving viable indoors throughout the year.^[12] Planning and design efforts spanned several years, with construction commencing around 2001 and involving intensive testing and engineering to realize the ambitious vertical structure in urban Brussels.^[9] The build, which integrated the deep shaft into an existing industrial site, overcame logistical hurdles of excavating and reinforcing a 33-meter-deep tower amid city constraints, culminating in the facility's completion after approximately three years of active work.^[13] Nemo 33 officially opened on May 1, 2004, marking the realization of Beernaerts' vision for a European diving hub.^[9]

Opening and Initial Recognition

Nemo 33 officially opened to the public on May 1, 2004, in Uccle, a municipality of Brussels, Belgium, marking the culmination of nearly seven years of development led by Belgian civil engineer and diving enthusiast John Beernaerts.^[14] Beernaerts, who conceived the facility in the mid-1990s as a safe, year-round alternative to open-water diving inspired by tropical conditions, played a central role in the opening ceremony, overseeing the inaugural dives that showcased its innovative design for recreational, training, and film purposes.^[15] His vision emphasized accessibility and comfort, with the pool's heated, crystal-clear spring water allowing divers of all levels to experience depths without the risks of natural environments.^[3] Upon its debut, Nemo 33 was immediately recognized by Guinness World Records as the deepest indoor swimming pool in the world, achieving a maximum depth of 33 meters (108 feet) and holding the title from 2004 until 2014.^[15] This accolade highlighted the facility's engineering feat, drawing global attention to its potential for advanced scuba training and exploration in a controlled setting.^[12] The opening generated significant early media buzz, with features in outlets such as BBC News, which showcased underwater photography from the pool's depths, and Popular Mechanics, which listed it among the world's 18 strangest pools for its surreal, cavern-like interior.^[16] Initial visitor accounts praised the unprecedented clarity and warmth—maintained at 33 degrees Celsius—enabling extended dives without wetsuits, while promotional events included guided introductory sessions and media dives that emphasized its novelty as a "swimming Disneyland."^[17] These activities quickly established Nemo 33 as a must-visit attraction for divers seeking a unique, phobia-inducing yet exhilarating experience.^[18]

Design and Specifications

Structural Layout

Nemo 33 is situated in Uccle, a municipality of Brussels, Belgium, at coordinates 50.796211°N, 4.316468°E, within an urban industrial building that integrates the facility seamlessly into the cityscape.^[19] The pool's overall structure forms a towering vertical shaft equivalent in depth to approximately 10 stories, reaching a maximum of 33 meters (108 feet) from surface to bottom, with a total water volume of 2,500,000 liters.^[20]^[4] This design creates a controlled, enclosed aquatic environment that emphasizes vertical exploration while maintaining structural stability in a confined indoor space. The facility employs a multi-level configuration to mimic progressive descent in natural dive sites, featuring descending platforms at intermediate depths such as 5 meters and 10 meters, connected by shafts and chambers that branch off the main vertical axis.^[5] These elements allow divers to transition gradually from shallow entry points at the surface to the deepest chamber at 33 meters, providing a structured path that simulates varied underwater topographies without the hazards of open water.^[12] The integration of these platforms and chambers within the single, cylindrical primary shaft ensures efficient space utilization and ease of access from the surface building. Large underwater viewing windows are embedded along the pool's walls, enabling non-divers at the surface-level bar and restaurant to observe activities below the waterline through the clear medium.^[10] This architectural feature enhances accessibility and spectator engagement, bridging the divide between submerged and terrestrial areas of the facility. The pool is filled exclusively with non-chlorinated freshwater, consisting of purified spring water sourced from local Belgian aquifers, which supports the overall design's emphasis on a pristine, breathable aquatic environment.^[4]^[2]

Water and Filtration System

Nemo 33 holds 2,500,000 liters of non-chlorinated spring water, sourced from local springs and initially filled to capacity upon construction.^[15]^[12] This volume is maintained through periodic top-ups to account for evaporation and minor losses, ensuring consistent levels across the facility's multiple depths.^[4] The water undergoes advanced filtration through purification systems that remove bacteria and impurities without relying on chemical additives like chlorine, promoting an eco-friendly approach with reduced environmental impact.^[12]^[18] Regular filtration cycles and quality testing maintain exceptional clarity, with visibility exceeding 30 meters, while the absence of artificial currents creates a calm, stable environment ideal for safe diving practice.^[4] Temperature is regulated year-round at a constant 33°C (91°F) via solar heaters and thermal insulation, allowing divers to forgo wetsuits for comfort during extended sessions.^[21]^[20] This energy-efficient heating method further underscores the facility's commitment to sustainability by minimizing reliance on conventional energy sources.^[18]

Facilities and Features

Surface-Level Amenities

Nemo 33 provides a range of surface-level facilities designed to enhance visitor comfort and convenience, catering to divers, trainees, and non-diving guests alike. The on-site restaurant offers Asian cuisine prepared by Vietnamese chefs, featuring fresh and refined specialties in a unique setting with views of the underwater pool through large windows.^[22]^[23] Open daily for lunch from 12:00 to 14:30 and dinner from 19:00 to 22:30, it includes a terrace adorned with bamboo for outdoor dining when weather permits.^[22] Additionally, a dive shop on the premises sells swimwear, souvenirs, and diving equipment, serving as a one-stop resource for visitors.^[12]^[24] Changing rooms equipped with lockers and showers are available to ensure hygiene and organization, where dive bags must be stored prior to entering the pool area.^[25]^[1] Equipment rental services, including wetsuits, regulators, and tanks, are provided in excellent condition by on-site staff who assist with sizing and fitting.^[26]^[12] These amenities integrate seamlessly with preparation areas, allowing smooth transitions from changing to briefing zones for diving sessions.^[4] For non-diving activities, Nemo 33 hosts aquafitness classes in shallower sections of the pool, including aquagym, aquabike, aquajump, aquayoga, and aquapower, promoting fitness in a controlled environment.^[27] As of November 2025, entry fees are structured to accommodate individuals and groups, with certified divers paying €30 per one-hour dive and non-certified participants €42 (including equipment and instructor guidance); group packages offer bundled options such as multiple dives with meals.^[25] The facility operates daily since its opening in 2004, typically from 10:00 AM to 10:30 PM on weekdays and 8:00 AM to 10:30 PM on weekends, with spaces supporting up to 250 guests for events like seminars or banquets, while the overall venue can accommodate up to 1,200 people.^[28]^[19] This setup ensures accessibility for tourists, amateurs, and professionals year-round.^[3]

Underwater Elements

The underwater layout of Nemo 33 is designed to mimic realistic diving conditions through a series of descending shafts and platforms that guide divers progressively deeper. The facility features a central cylindrical pit reaching a maximum depth of 33 meters, surrounded by flat-bottomed areas at shallower levels, including platforms at approximately 5 meters and 10 meters for staging and exploration.^[3]^[12] Divers descend via open shafts without natural light penetration at greater depths, creating an immersive, cave-like ambiance that simulates open-water environments.^[5] At the 10-meter level, simulated underwater caves and narrow passages provide opportunities for confined-space exploration, complete with interconnected chambers equipped with air pockets for brief surface intervals.^[12] These structures include pressurized rooms where divers can breathe ambient air, enhancing safety and allowing for extended navigation through the labyrinthine pathways.^[10] The high water clarity supports visibility throughout these areas, though the focus remains on the structural immersion rather than filtration details.^[5] Themed installations add variety to the underwater experience, such as large observation windows that permit external viewing into the pool from adjacent spaces.^[12] Occasional setups, including temporary art exhibits like photographic displays positioned at depths from 1.5 to 10 meters, have been incorporated to support training, filming, or educational purposes.^[12] A notable permanent feature is The Pearl, a spherical chamber at around 5 meters depth serving as an underwater dining area with air supply, accommodating small groups in a pressurized environment.^[5] The pool's constant water temperature of 33°C enables prolonged bottom times at depth without the need for thermal protection like dry suits, reducing physiological stress and allowing focus on the exploratory elements.^[12] This warmth, maintained year-round, distinguishes Nemo 33 from colder natural dive sites and supports diverse underwater activities within its simulated realms.^[5]

Activities and Uses

Diving Options

Nemo 33 offers a range of scuba diving activities designed to simulate open-water conditions in a controlled indoor environment, allowing divers to explore depths up to 33 meters through multi-level platforms and underwater tunnels.^[3] Individual entries are available for certified divers in pairs or small groups of fewer than 10, with sessions lasting one hour, including briefing and equipment setup, and access to the full depth for skill practice without marine life interference.^[25] Group scuba dives for 10 or more participants follow a similar one-hour format, emphasizing buddy systems and recreational exploration suitable for beginners to advanced levels, with options for evening slots that can facilitate night dive simulations under facility lighting.^[29] Deep dives to the pool's maximum depth provide opportunities for advanced buoyancy control and decompression practice, while shallower plateaus at 5 to 10 meters support introductory skill-building in a safe setting.^[25] Guided buddy dives or instructor-led tours are available for non-certified participants paired with professionals, focusing on exploratory immersion rather than formal instruction.^[25] Freediving sessions at Nemo 33 cater to breath-hold enthusiasts with controlled access to the 33-meter and 10-meter zones, available as individual or group entries requiring pairs for safety.^[30] These 90-minute sessions, held multiple evenings per week, emphasize relaxation and depth progression in clear, warm water, with buoys provided for surface support and no mechanical aids permitted.^[30] Group freediving for 15 or more occurs in two-hour slots on weekends, allowing collective breath-hold dives to build endurance and technique.^[31] Beyond standard recreation, Nemo 33 accommodates specialized uses such as film production shoots and professional equipment testing, leveraging its depth and structures for underwater cinematography and gear validation in a non-tidal environment.^[9] All sessions typically span 1 to 2 hours, prioritizing skill enhancement through repeated immersions in the facility's artificial underwater caves and passageways.^[29]

Educational and Training Programs

Nemo 33 serves as an authorized SSI (Scuba Schools International) training center, offering a range of scuba diving certification programs tailored to participants from beginners to advanced levels. These include entry-level Open Water Diver courses, which introduce fundamental skills such as equipment handling, buoyancy control, and underwater navigation, as well as advanced options like Advanced Adventurer and specialty certifications in deep diving, enriched air nitrox, and full-face mask usage.^[1]^[32] The programs follow a structured format typically spanning multiple days or sessions, combining online theory modules reviewed in classroom settings with practical confined-water training in the facility's multi-level pools and simulated deep dives up to 20 meters. Participants must be at least 12 years old and, for uncertified individuals, require direct supervision by an on-site instructor to ensure safe progression. Freediving workshops are also available through SSI, starting with introductory sessions and progressing to certified levels like Freediver (up to 20 meters) and Advanced Freediver (up to 30 meters), emphasizing breath-hold techniques, equalization, and relaxation in a controlled environment.^[33]^[34] Advanced rescue training, such as the SSI Diver Stress and Rescue specialty, builds on Open Water certification through five 3.5-hour sessions focused on emergency management, self-rescue, and assisting distressed divers, incorporating scenario-based drills in the pool's deeper sections. Certified instructors, qualified under SSI standards, lead all programs, with the on-site dive shop supplying rental equipment including regulators, buoyancy compensators, and wetsuits, while prioritizing safety protocols adapted to the pool's exceptional depth for realistic skill development.^[35] Upon completion, participants receive internationally recognized SSI digital certifications that qualify them for independent open-water diving worldwide, often serving as a bridge to outdoor environments. The facility's programs have also been utilized by professional teams for specialized training, including security operations and research simulations, leveraging the controlled 33-meter depth for high-fidelity practice without external variables.^[18] As of 2025, the Nemo 33 brand has expanded to additional sites, including an outdoor quarry dive center in Scouffleny opened in 2023, offering complementary open-water style activities alongside the original indoor pool programs in Brussels.^[3]^[36]

Safety and Operations

Diver Requirements

To participate in scuba diving at Nemo 33, individuals must be at least 12 years old.^[25] Certified divers are required to present a valid diving certification upon arrival, along with a medical certificate and dive insurance. Non-certified participants must dive under the direct supervision of an authorized instructor.^[25] A buddy system is mandatory, meaning all dives must be conducted in pairs or small supervised groups, with solo dives strictly prohibited.^[25] Health requirements emphasize good physical condition and medical fitness for diving, particularly for licensed divers. Non-certified divers under supervision should follow instructor guidelines for health suitability.^[25] Non-certified divers are restricted to shallower areas unless accompanied by an instructor, who can facilitate progression based on skill assessment. Booking is essential and handled through the official online system, with arrivals recommended at least 30 minutes early to verify documentation.^[25] Fees for individual licensed divers or instructors are €30 per dive, including a tank, while non-certified students pay €30 online plus €12 on-site for equipment.^[25] Group bookings, requiring a minimum of 10 divers, start at €260 for the base slot, with additional costs settled on-site; larger groups or packages may include meals or extended access.^[29] Nemo 33 accommodates a wide range of participants, including tourists, amateur enthusiasts, and professional divers, provided they meet the eligibility criteria. The facility's warm water temperature minimizes the need for heavy thermal gear, enhancing accessibility for varied experience levels.^[25]

Facility Safety Measures

Nemo 33 maintains rigorous safety protocols through mandatory pre-dive briefings conducted at the poolside, where all participants receive instruction on internal rules and regulations, including the requirement to dive in buddy pairs for mutual supervision. These briefings emphasize responsible use of the facility and ensure divers are aware of operational guidelines to prevent incidents.^[25] The facility's infrastructure supports safety with advanced environmental controls, utilizing a sophisticated filtration system that circulates purified spring water without chlorine, resulting in exceptional visibility and the absence of currents that could disorient divers. Regular maintenance of this system is integral to operations, contributing to the controlled conditions that minimize risks associated with open-water diving. Evacuation protocols for the tower structure are in place to facilitate orderly exits in emergencies, leveraging the indoor design for quick surface access.^[4]^[3] Dive masters and instructors provide ongoing monitoring during sessions. The facility's design includes rest platforms for safe ascents. All equipment, including provided air tanks and optional rentals for regulators and BCDs, undergoes routine checks to ensure reliability.^[25] As an SSI-affiliated dive center, Nemo 33 adheres to Belgian national regulations and international diving standards, including comprehensive staff training in first aid, emergency response, and rescue techniques. Daily operational briefings for both staff and divers reinforce these protocols, fostering a proactive safety culture. Mandatory medical examinations are required for course participants as per standards.^[3] The controlled indoor setting has resulted in a low incident record since opening in 2004, with no reported accidents during supervised operations as of 2025; the sole fatality occurred in 2011 when an employee attempted unsupervised freediving after closing hours, highlighting the importance of adherence to protocols. This safety emphasis, combined with the facility's engineering, has made Nemo 33 a benchmark for secure deep-water training environments.^[37]^[3]

Legacy and Comparisons

World Record and Surpassing Pools

Nemo 33 held the Guinness World Records title for the deepest indoor swimming pool from its opening on May 1, 2004, until June 5, 2014, when it was surpassed by the Y-40 in Montegrotto Terme, Italy, at a depth of 42 meters.^[38]^[15] The facility's maximum depth of 33 meters allowed for advanced diving simulations in a controlled environment, setting a benchmark for indoor aquatic training venues.^[10] The Y-40, designed by architect Emanuele Boaretto, features a serpentine shape with underwater viewing windows, therapeutic thermal spring water maintained at around 34°C, and accessibility via a submerged acrylic tube elevator for non-divers, primarily serving scuba training, freediving, and rehabilitation purposes.^[39]^[40] This innovation in user-friendly deep-water access marked a shift toward multifunctional facilities beyond pure depth competition. Subsequent developments included Deepspot in Mszczonów, Poland, which opened in November 2020 at 45 meters deep, incorporating artificial underwater caves and simulated Mayan ruins for enhanced training scenarios in crystal-clear, warm water (32–34°C), aimed at divers of all experience levels to build skills safely.^[41]^[42] Deep Dive Dubai in the United Arab Emirates followed in July 2021, reaching 60.02 meters in an oyster-shaped structure honoring local pearl-diving heritage, complete with a themed "sunken city" including furnished rooms and vehicles for immersive scuba, freediving, and media production experiences.^[43]^[44] Nemo 33 pioneered the use of non-chlorinated, highly filtered spring water heated to 33°C via solar power, creating a skin-friendly, low-irritation environment that reduced diver discomfort during extended sessions and influenced subsequent pools like Y-40 and Deepspot to adopt similar filtration and thermal systems for improved safety and appeal.^[2]^[14]^[45] During its record-holding era, Nemo 33 received notable media attention, including a feature in Popular Mechanics as one of the world's 18 strangest pools for its extreme depth and innovative design, and coverage by BBC News highlighting underwater photography sessions that showcased its unique diving conditions.^[17]^[46]

Current Status and Impact

As of 2025, Nemo 33 continues to operate as a premier indoor diving facility in Brussels, Belgium, offering daily scuba and freediving sessions, certification courses, and specialized events such as underwater gourmet experiences in its 33-meter-deep, non-chlorinated pool maintained at a constant 33°C. The site's official resources and recent visitor feedback confirm uninterrupted activity, with bookings available year-round for individuals and groups, underscoring its accessibility for training and recreation despite seasonal weather challenges in Europe.^[3]^[8]^[47] Following the loss of its Guinness World Record status to deeper pools like Y-40 in Italy, Nemo 33 has adapted by emphasizing advanced diver education, recreational tourism, and unique immersive activities over depth competition. This shift includes expanded course offerings in freediving and technical diving, alongside a new facility in Haute-Savoie near Geneva (opened October 2025) and planned facilities in Scouffleny near Nivelles to extend its operational footprint across Europe.^[4]^[3] The facility has significantly influenced diving research, particularly in human physiology, by serving as a controlled environment for studies on decompression effects, including vascular gas emboli detection after deep dives and the impact of pre-dive interventions like dark chocolate ingestion on endothelial function. Partnerships with organizations such as Divers Alert Network Europe have facilitated ophthalmic and cardiovascular research, contributing to safer diving protocols. Nemo 33 also draws international visitors annually, fostering a global community of divers while its sustainable design—featuring purified spring water, solar heating, and lower energy consumption than traditional pools—has inspired eco-conscious models for indoor aquatic centers.^[48]^[49]^[50]^[51]^[11] With no indications of closure and active expansion initiatives, Nemo 33 maintains a central role in Europe's diving ecosystem, supporting professional training through affiliations like Scuba Schools International and promoting accessible, environmentally responsible aquatic sports.^[3]^[1]

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[51]
The effect of pre-dive ingestion of dark chocolate on endothelial ...
They performed a 33-metres deep scuba-air dive for 20 minutes in a diving pool (Nemo 33, Brussels). Water temperature was 33⁰C. The chocolate group ingested ...
[52]
Exploring the Depths: World's Deepest Pools as Cutting-Edge ...
May 23, 2023 · With the use of 5 depth platforms, Nemo33 also uses its pool to conduct physiology research by partnering with Divers Alert Network (DAN) Europe ...
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Nemo 33 | Scuba Dive in the Worlds Largest Pool
The pool opened in 2004 after almost 7 years of being in construction. Nemo 33 is essitaly the type of pool you can get lost in if you are not careful. The ...Missing: promotional | Show results with:promotional