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bathysphere
A hollow steel sphere suspended by cables from a surface ship and used for deep-sea research before the development of the bathyscaphe. The first bathysphere was built and used by the the engineer Otis Barton and the naturalist William Beebe in 1930; diving of Bermuda in 1934 they reached a then-record depth of 3,023 feet (923 meters).
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• TECHNOLOGY
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