Astronauts Buzz Aldrin, left, and Mike Gernhardt, center, converse with Roane State Community College Associate Professor Bruce Cantrell, right, Thursday, Oct. 16, 2014, while broadcasting a live online show as a facet of the Classroom Under the Sea project at Jules Undersea Lodge in Key Largo, Fla. Cantrell and Roane State Adjunct Professor Jessica Fain are endeavoring to spend 73 consecutive days in the habitat, positioned 25 feet beneath the surface of a Florida Keys lagoon, to break an underwater living record.

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