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| | BATHYSCAPHE, |
 | | The first such vessel, invented in 1947 by the Swiss physicist Auguste Piccard, explored the ocean bottom at a depth, in 1954, as great as 4000 m (13,125 ft) and operated under water pressure of 0.42 metric ton/sq cm. |
 | | The bathyscaphe Trieste, built in 1953, set a world record on Jan. 23, 1960, when it descended 10,916 m (about 35,814 ft) to the bottom of the Mariana Trench, deepest known point in the oceans, 402 km (250 mi) southwest of Guam. |
 | | The Trieste was also used in the unsuccessful search for the hull of the nuclear submarine USS Thresher, which had plunged 2560 m (8400 ft) to the ocean floor 354 km (220 mi) off the coast of New England in April 1963. |
| www.history.com /encyclopedia.do?articleId=202405 (273 words) |
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