The Aquarius Underwater Habitat - Project SeaCAMEL

Aquarius is an underwater laboratory and habitat which sits at a depth of sixty-two feet under the ocean's surface. It is located nine miles southeast from the habitat's operations centre in Key Largo, Florida, and three miles off-shore in the Florida Keys National Marine Sanctuary.
The habitat was created to advance underwater research by creating an environment which allows scientists to spend significantly long periods of time underwater without risking their safety.
Scientists who live in Aquarius, or "Aquanauts" as they're called, can live in the habitat indefinitely and have much more bottom time (time spent at depth underwater) than surface divers (doing a single dive from a boat). Aquanauts can work and live on the seafloor for such a long period of time because they "saturate," meaning that their tissues absorb maximum partial pressure of nitrogen gas. To prevent decompression sickness (commonly know as "the bends") when the divers return to the surface, the Aquanauts stay in Aquarius for seventeen hours at the end of the mission while the pressure inside the habitat is slowly brought back to that of sea level. This unique technology allows scientists to research safely underwater for an indefinite period of time.
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