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Deepest Manned Ocean Descent The deepest ever manned ocean descent was on January 23, 1960, when Dr Jacques Piccard (Switzerland) and Lt. Donald Walsh, USN, piloted the US Navy bathyscaphe Trieste to a depth of 10,911 m (35,797 ft) in the Challenger Deep section of the Mariana Trench. Challenger Deep is thought to be the deepest point on earth and is situated 400 km (250 miles) south-west of Guam in the Pacific Ocean.
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