How can submarines rise to the water surface on their own?
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submarines use ballast that are filled with air or sea water in order to increase or decrease the subs density and cause it to sink or float, much as a whale displaces oxygen from its lungs in order to increase its density.
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Answer:
In order to control buoyancy, the submarine relies on special tanks that can be filled with water or air. To return to the surface, the tanks are filled with air. This makes the submarine less dense than the water around it, causing the sub to float to the surface
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