A bathyscaphe has two main components: a crew cabin and a float. The crew cabin is the small, rounded "observation gondola" identified in this schematic drawing of the Trieste. The float is the largest part of the bathyscaphe, made up of air tanks and gasoline tanks.

Illustration courtesy U.S. Naval Historical Center

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bathyscaphe Encyclopedic Entry

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A bathyscaphe is a self-propelled vehicle used for deep-sea dives