Word: plongeur
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Dates: during 1920-1929
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...followed Bushnell's ideas with a Nautilus which dived down 25 feet and stayed down four hours, its crew breathing compressed air. The South used submarines in the Civil War and one sank the Federal warship Housatonic though swamped and sunk herself by her torpedo's explosion. The French Plongeur of 1863 was 146 feet long, driven by compressed air motor. The significant features of the Holland experiments were the in troduction of a gasoline engine and of internal ballast tanks to admit and lower the ship's buoyance so that she could bs steered bottom-ward by horizontal rudders...