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The Aquarius Reef Base is an underwater habitat which was built for oceanographic research and is the world’s only undersea laboratories. Sitting 60 feet beneath the surface in the Florida Keys National Marine Sanctuary, it’s a globally significant asset that provides unparalleled means to study the ocean, test and develop state-of-the-art undersea technology, train specialized divers and astronauts, and engage the world’s imagination.

Operations Director, Roger Garcia is a former military diver who is in charge overseeing diving operations and assuring the safety of all participants and aquanauts. The BBC recently spoke with Garcia about the most common physiological changes that face the aquanauts as they live and work for days on end fifty feet under the sea.

Listen to the clip