Confidence votes 66. Its average depth is 4,637 meters (2.8 miles). It is home to the deepest known point in the ocean-the Mariana Trench off Guam-which plunges to a depth of about 10,924 meters (nearly 7 miles).Because of the depth of the Pacific Ocean, tsunamis (huge waves created by earthquakes) can reach speeds of 750 kilometers an hour, the same velocity as a jet airplane.eal Deep ;)  Actually, it can get to 35,838 feet. That's how deep Challenger Deep in the Marianas Trench off the Marianas Island in the Pacific Ocean gets. The U.S. Navy su … bmersible Trieste reached it in 1960. That's about a mile deeper than Mount Everest is high.