Fish swimming near the Aquarius Reef Base in the Florida Keys National Marine Sanctuary (© Stephen Frink/Corbis)

Fish swimming near the Aquarius Reef Base in the Florida Keys National Marine Sanctuary (© Stephen Frink/Corbis)

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• The “reef” we\re looking at...""Is actually an underwater habitat for humans
• The aquanauts of Mission 31 started their journey...""With a splashdown
• Though these fish are tooling around a man-made structure...""They\re swimming near the only barrier reef in the United States
• Why does Fabien Cousteau want to stay submerged for 31 days? To one-up his grandfather, who already hit the 30-day mark.""Grandpa Jacques even made a documentary about it