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The Aquarius Reef Base is an underwater habitat located 5.4 miles (9 kilometers) off Key Largo in the Florida Keys National Marine Sanctuary. It is deployed on the ocean floor 62 feet (19 meters) below the surface and next to a deep coral reef named Conch Reef. Aquarius is the only undersea laboratory in the world dedicated to science and education. It was owned by the National Oceanic and Atmospheric Administration (NOAA) and operated by the University of North Carolina–Wilmington until 2013 when Florida International University assumed operational control

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The SeaOrbiter, also known as Sea Orbiter is a planned oceangoing research vessel.  Similar to a space ship, the SeaOrbiter will allow scientists and others a residential yet mobile research station positioned under the oceans’ surface. The station will have laboratories, workshops, living quarters and a pressurized deck to support divers and submarines.  [source]