Submarines dive by allowing water to expel air from their … tanks? How do they regain buoyancy in order to surface?
In: Engineering
One thing that’s not been mentioned so far–in an ideal situation they’d only take enough water into the ballast tanks to make the submarine *neutrally buoyant* (e.g. doesn’t have any tendency to sink *or* to float)–they then control their depth primarily using diving planes as they move forward. This means they can also use the diving planes to rise up close to the surface before blowing the water out of the ballast tanks, which makes the process much easier due to less pressure acting against the compressed air.
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