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How does a submarine sink and float?
There are valves on a submarine that allow water in to the ballast tank. The more water in the ballast tank the faster the submarine will descend into the ocean. To surface, the core of the submarine lets out air into the ballast tank making the water rush out of the flood ports making the submarine more buoyant. This buoyancy will allow the submarine to ascend to the surface. Look at Boyle's law to better understand.

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First answer by ID0402874681. Last edit by Turtles27. Contributor trust: 0 [recommend contributor]. Question popularity: 9 [recommend question].

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