But geophysicists have developed a method to determine what kind of crust on the bottom of the sea - continental or oceanic, devoid of granite layer and so much more thin (on the continents it is up to 70 kilometers, in the depths of the ocean - 5-6 or even 3 km) . What was surprising to scientists, when they discovered the Sea of ??Okhotsk continental crust at depths of 1300-1500 meters! Obviously, neither of which flooded after raising the level of the oceans, and there can be no question. But surely sinking huge land mass as a result of movements of the earth's crust.