The Trieste was a Swiss-designed deep-diving research bathyscaphe ("deep boat") with a crew of two, which reached a record-breaking depth of about 10,911 metres (35,797 ft), in the deepest known part of any ocean on Earth, the Challenger Deep in the Mariana Trench, on January 23, 1960.
Challenger Deep
The Challenger Deep is the deepest surveyed point in the oceans, with a depth of approximately 36,000 feet (11,000 meters). It is located at the southern end of the Mariana Trench near the Mariana Islands group. The Challenger Deep is a relatively small slot-shaped depression in the bottom of a considerably larger crescent-shaped trench, which itself is an unusually deep feature in the ocean floor.
The closest land to the Challenger Deep is Fais Island (one of the outer islands of Yap), 289 km (180 mi) southwest, and Guam, 306 km (190 mi) to the northeast. The depression is named after the British Royal Navy survey ship HMS Challenger, whose expedition of 1872–76 made the first recordings of its depth.
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