how are submarines designed to stay underwater
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Hey dude....
A submarine is designed to have positive buoyancy when it ballast tanks are blown dry (full of air). A ballast tank is a tank wrapped around the outside of the pressure hull with a set of valves on the top and holes on the bottom. ... The boat stays underwater by not becoming positively buoyant.
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Følløw mê ✌✌
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Answer, it has water tanks when it needs to go underwater it fills those with water and it needs to go up again it pushes the water out of tanks and fills air in it,thus it is based on density
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