http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Medicine/oddsnends.htm
Average depths of the three oceans are similar;: Pacific,
12, 925 ft.; Atlantic, 11, 730 ft.; Indian 12, 598 ft. The continental shelf is the gently sloping floor of the ocean surrounding the
continents, from sea level to a depth of about 600 feet. its width varies from almost
nothing to 800 miles, with an average about 30 miles.