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2023-04-04 
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While thousands of climbers have successfully scaled Mount Everest, the highest point on Earth, only two people have descended to the planet’s deepest point, the Challenger Deep in the Pacific Ocean’s Mariana Trench.
Located in the western Pacific east of the Philippines and an average of approximately 124 miles (200 kilometers) east of the Mariana Islands, the Mariana Trench is a crescent-shaped scar in the Earth’s crust that measures more than 1,500 miles (2,550 kilometers) long and 43 miles (69 kilometers) wide on average. The distance between the surface of the ocean and the trench’s deepest point—the Challenger Deep, which lies about 200 miles (322 kilometers) southwest of the U.S. territory of Guam—is nearly 7 miles (11 kilometers). If Mount Everest were dropped into the Mariana Trench, its peak would still be more than a mile (1.6 kilometers) underwater.
The Mariana Trench is part of a global network of deep troughs that cut across the ocean floor. They form when two tectonic plates collide. At the collision point, one of the plates dives beneath the other into the Earth’s mantle, creating an ocean trench.
The depths of the Mariana Trench were first plumbed in 1875 by the British ship H.M.S. Challenger as part of the first global oceanographic cruise. The Challenger scientists recorded a depth of 4,475 fathoms (about five miles, or eight kilometers) using a weighted sounding rope. In 1951, the British vessel H.M.S. Challenger II returned to the spot with an echo-sounder and measured a depth of nearly 7 miles (11 kilometers).
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