Mariana Trench, Oceanic trench in Western Pacific Ocean, Northern Mariana Islands, US.
The Mariana Trench runs for 2540 kilometers in a crescent along the floor of the Pacific, dropping to depths of 11 kilometers at its lowest point. It sits east of the Philippines and south of Japan, with the deepest sections lying in the southwestern portion of the formation.
The HMS Challenger made the first measurements in 1875, recording a depth of 8184 meters using hemp rope. Later expeditions in the 20th century refined the data, and manned descents reached the bottom for the first time in 1960 with the bathyscaphe Trieste.
This part of the Pacific sits under American administration, but the islands nearby remain home to Chamorro people and other Micronesian communities. Fishing and seafaring continue to shape daily routines for families along the coast, and the ocean remains central to their way of life.
The deepest point sits under extreme pressure exceeding 1086 bars and temperatures between 1 and 4 degrees Celsius (34 to 39 degrees Fahrenheit). Access is only possible with specialized research submersibles, and surface diving in the surrounding waters requires permits and local guidance.
The Challenger Deep in the southwestern section marks the deepest known point on the surface of Earth at 10,911 meters (35,797 feet). Despite the darkness and crushing pressure, life exists on the bottom, including small crustaceans and translucent fish adapted to the conditions.
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