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It is the control planes on the submarine that are the primary method of normally controlling the rate of ascent or descent of the craft. Note that submarines have a few different configurations as regards planes. The stern planes are used alone, or in conjunction with the bow planes, if the boat is equiped with the latter ones, to change what is called "the bubble" or the angle of attack. On some boats, there are planes on what is called the fairwater or sail ("conning tower"), and these, the so-called fairwater planes, can be used to change depth slowly while maneuvering. It is these planes that are instrumental in maintaining depth on a properly trimmed boat as they are centrally mounted, and act to push the "whole boat" down or up without changing the bubble. Ballast tanks are flooded completely to dive and to conduct subsurface operations. The bouyancy of the boat (along with the trim) is controlled by the partially flooding the trim tanks.

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