How does buoyancy and density help a submarine to dive and float?

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Answer:
A submarine has buoyancy tanks along its length. To dive or sink these are filled with water, which enters through valves, so the vessel becomes heavier. Its speed of descent can be controlled by the amount of water in the tanks and also by aerilons (small wings) which can be tilted to steepen the dive. There is obviously a depth limit for each submarine.
To surface the vessel blows the water out with compressed air, the vessel gets lighter (more buoyant) and rises to the surface.
First answer by Exiled Scouser. Last edit by Exiled Scouser. Contributor trust: 0 [recommend contributorrecommended]. Question popularity: 1 [recommend question].

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