Okay, I just want to know when does a submarine experience greater buoyant force? Is it when it is near the surface of the ocean or near the ocean floor, considering gravity is the same for both situations.

Buoyant forces are more at surface.

The buoyant force is only proportional to the submerged volume of the object, with the net force felt by the object being the Force due to gravity - the buoyant force.

It does not vary with depth unless the density of the water does, if the density increases then the buoyant force does also.

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Originally Posted by rajeevsrai

buoyant forces are more at surface.

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I suppose the submarine are different than simple objects. Net force will be gravity minus upward thrust. At the surface wieght of sub is less because of air filled in. at a depth water is allowed so net upward force is reduced.

Ah, I missed that it was a submarine! But the amount of air is independent of depth. The amount of air is used to accelerate up or downwards, not to determine position in the water.