Denise was her original name, and she was the first underwater vehicle designed expressly for scientific exploration. From 1959 on, the mini-submersible sailed the depths to explore unknown parts of the ocean. On board Calypso, a crane lowered the saucer into the water or lifted her up to the rear deck of the ship. With a diameter of 2.85 meters and a weight of 3.5 tons, she carries a crew of two in her steel cabin. She can work stay as far as 350 meters down, for four or five hours...

More information on this and on sea exploration:
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http://www.cousteau.org/
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