Philippine Trench, also called Philippine Deep, Mindanao Trench, or Mindanao Deep, submarine trench in the floor of the Philippine Sea of the western North Pacific Ocean bordering the east coast of the island of Mindanao. The abyss, which reaches the second greatest depth known in any ocean, was first plumbed in 1927 by the German ship Emden. The reading obtained at that time was the first indication of the actual near-record depth. In 1945 the USS Cape Johnsonrecorded a sounding of 34,440 feet (10,497 metres).
How was this trench is formed?
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