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Submarines change their depth by use of ballast tanks. To dive, they open their tanks so that they become filled with water. They also angle their dive planes. To surface, they pump the water out of their tanks and fill them with pressurised air.

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13y ago

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Why do submarines float to the surface when the air is let out?

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Submarines sink or float by adjusting their buoyancy through the use of ballast tanks. When water is pumped into these tanks, the submarine becomes heavier than the water around it, causing it to sink. Conversely, to float, the submarine expels water from the ballast tanks, reducing its weight and allowing it to rise to the surface. This ability to control buoyancy enables submarines to navigate underwater and at the surface efficiently.


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They use ballast tanks to contain sea water or air to control their depth


Why do ships float while submarines sink?

Submarines are designed with enough ballast and control systems to allow them to submerge and surface as needed.Surface ships are designed only with enough ballast and control systems to keep them on the surface. While they can sink just as well as submarines can, their ability to re-surface without a salvage operation is non-existent.


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Do people float in submarines?

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