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Zhemchug Canyon is an underwater canyon located in the middle of the Bering Sea. This submarine canyon is the deepest and is tied for widest canyon in the ocean
It has a vertical relief of 8,530 feet or 2,600 meters dropping from the shallow shelf of the Bering Sea to the depths of the Aleutian Basin. Zhemchug Canyon is deeper than the Grand Canyon which is 6,093 feet or 1,857 meters deep. It has two main branches, each larger than typical continental margin canyons such as the Monterey Canyon. What makes the Zhemchug Canyon the world's largest is not only its great depth, but its immense cross-sectional and drainage area, (11,350 km2) and volume (5800 km3).
In 2016, Michelle Ridgeway explored the canyon piloting an eight-foot submarine in an expedition sponsored by Greenpeace. She reached a shelf at a depth of 1,757 feet or 536 meters, that is, a third of a mile below the surface.