The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam. Challenger Deep is approximately 10,935 meters (35,876 feet) deep.
The Horizon Deep in the Tonga Trench in the Southwestern Pacific Ocean is 35,433 feet deep, making it the second deepest trench in the world by less than 400 feet. The third deepest is the Sirena Deep, also in the Mariana Trench. The Sirena Deep measures 35,151 feet and is approximately 120 miles east of the Challenger Deep.
In 1960, Don Walsh and Jacques Piccard were the first two humans to reach Challenger Deep, completing that dive as a team.
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