Where is the deepest part of the ocean?

Ocean depth - the deepest part of the ocean is the Marianas Trench off the Philippine Islands in the South Pacific. There the sea floor lies 36,198 feet below the waves. So the distance to the surface is more than a mile greater than the height of Mount Everest. Jacques Piccard and Lt. Donald Walsh descended to the bottom of the Marianas Trench on January 23, 1960 in the United States Navy bathyscaphe Trieste. It took four and a half hours to make the trip to the bottom, where the water pressure was eight tons to the square inch. This is the nearest men have come to making a journey to the centre of the earth. The average depth of water in the world's oceans is 12,000 feet. But, apart from the Marianas Trench, there are other trenches in the seabed more than six miles deep. The floor of the ocean is, of course, as well defined with canyons and "mountain" peaks as the dry land of the earth, something we do not normally consider when we look at the ocean surface.