Jules' Undersea Lab in Key Largo, Florida

Sitting in a lagoon at MarineLab Undersea Park in Key Largo, this pressurized habitat is a compact world of portholes, bunks, and machinery with an uncanny feeling of domestic coziness. MarineLab describes it as the world’s only underwater habitat where recreational divers can experience living and sleeping underwater, and the broader organization traces the habitat’s story back to La Chalupa, an earlier undersea research station in the Caribbean. Over time, the habitat shifted roles from research station to hotel and now to an educational attraction operated by the nonprofit Marine Resourc...