Submarines dive by allowing water to expel air from their … tanks? How do they regain buoyancy in order to surface?
In: Engineering
They have compressed air tanks on board (and compressors to refill them when they’re at the surface) but these are generally for emergency use only. Subs have control surfaces similar to the wings on a plane and adjust these with forward propulsion in order to ascend in normal circumstances. When they approach the surface they then use their snorkel mast to suck in air in order to blow the water out of the ballast tanks allowing them remain buoyant even without forward propulsion.
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