The Challenger Deep is the deepest known point in the Earth's seabed hydrosphere. It is located at the southern end of the Mariana Trench in the Pacific Ocean, near the island of Guam. The depth is approximately 35,876 feet (10,935 meters) below sea level. To put this in perspective, if you dropped Mount Everest into the Challenger Deep, its peak would still be more than a mile underwater. The pressure at the bottom is over 1,000 times the standard atmospheric pressure at sea level. Only a handful of humans have ever descended to the bottom, the first being Jacques Piccard and Don Walsh in the bathyscaphe Trieste in 1960.