A new underwater habitat for scientific research has been anchored to the seabed in US waters about 4.5 miles off the Florida Keys, with a foundation designed to withstand the powerful water flows generated by a Category 5 hurricane. Known as Vanguard, the habitat was installed in June at Tennessee Reef in the Florida Keys National Marine Sanctuary by DEEP, an international ocean engineering and technology company with facilities in the United Kingdom and the United States.
Vanguard sits roughly 60 feet below the surface, close to but not within the reef. Its location near an undersea slope will also allow scientists to conduct research at greater depths, said Scott Olson, DEEP’s US program manager. It is the first underwater habitat in the region since the Aquarius Reef Base, which was initially installed near the US Virgin Islands in the 1980s before being relocated to the Florida Keys. Key DEEP staff members have lived and worked at Aquarius, bringing their expertise to Vanguard, Olson added.
What is Vanguard, and how does it work?
The four-person Vanguard habitat is intended to be a “pilot structure – a practice run for more ambitious underwater projects coming in the future,” Olson said. While future habitats are likely to be larger and modular, Vanguard was constructed primarily from an existing industrial structure that Olson called an “off-the-shelf decompression chamber.”
Its main section is a steel living chamber divided into two compartments. One contains bunks, a table, a galley and personal storage space for crewmembers. The other serves as a work area with scientific equipment and facilities such as a toilet.
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The living chamber also functions as a decompression chamber for divers who remain underwater for extended periods, a practice known as saturation diving. Decompression usually takes around 16 hours and happens largely overnight while the crew is asleep.
An exterior frame of steel tubes encases the habitat’s main cylinder and wet porch.
DEEP also attached a third section called the “wet porch” to the science compartment. The boxlike steel structure includes a moon pool that allows divers to enter and exit the habitat easily. The cylinder and wet porch are made from high-strength steel between a quarter of an inch and three-quarters of an inch thick, with stiffeners in key locations, Olson said.
How Vanguard is designed to withstand Category 5 hurricanes
Vanguard features an exterior frame of steel tubes arranged in a honeycomb pattern around its main cylinder and wet porch. Its foundation consists of a large steel frame with four legs, known as the base plate.
Weighing about 220 tons, the base plate includes two heavy steel ballast weights. The weight is necessary to secure the habitat to the seabed and keep it in place even during a Category 5 hurricane, Olson explained.
Although the base plate's legs are embedded in sand about 60 feet underwater, the top of the habitat is only about 36 feet below the surface. At that depth, horizontal water flow during powerful storms can be particularly strong.
DEEP's Vanguard habitat was lowered into place on steel piles from a surface barge using a heavy crane at Tennessee Reef in the Florida Keys National Marine Sanctuary.
Unique Group, a subsea technology and engineering firm, examined 100 years’ worth of meteorological studies for the site, including the wind and wave energy generated during severe storms. The research determined that Vanguard would need to withstand a possible water flow rate of 6 meters per second.
DEEP consequently added steel piles to the foundation, sinking them about 10 feet into the underlying limestone. Chains connecting the legs and piles provide some slack while minimizing sideways movement during storms.
How engineers protected the marine sanctuary
DEEP worked closely with the Florida Keys National Marine Sanctuary, part of the National Oceanic and Atmospheric Administration, to secure the necessary permits and identify a suitable installation site.
The team commissioned a bathymetric survey to map the seabed, a geotechnical survey to collect soil core samples, and a biological survey to ensure there were no live corals or conchs in the proposed area. The surveys were led by Unique Group. The studies identified a sandy area large enough to accommodate Vanguard's footprint of roughly 46 feet by 39 feet.
Before installation, divers used dredging equipment to level the sand. Once the habitat was in place, the sand was blown back to restore the site as much as possible to its original condition.
The structure was lowered from a surface barge using a heavy crane, guided onto two tall poles and secured with horizontal pins. Installation took more than a month, with progress depending on wind and wave conditions.
Umbilical lines supply power, oxygen and communication links from a support buoy at the surface. The buoy is secured by four additional seabed piles, chains, mooring lines and floats designed to prevent the equipment from scraping across the site and damaging the ecosystem.
When will Vanguard open to researchers?
Vanguard is undergoing commissioning by DNV, an international maritime certification organization, while DEEP trains its crews to operate the habitat.
The company expects to welcome its first “paying customers” — divers and researchers who will rent Vanguard for specific periods — in early 2027.
At least one DEEP staff member will remain inside the habitat to assist visiting scientists. The site will also be remotely monitored 24/7 from DEEP’s office in Marathon, Florida, Olson said.
Vanguard will provide researchers with a base for underwater scientific work while serving as a pilot for DEEP’s more ambitious subsea habitat projects planned for the future.