How does a submarine submerge and resurface?

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TECHNOLOGY QUESTION #8379

How does a submarine submerge and resurface?

With the aid of tanks with and without water

Explanation

A submarine is a watercraft capable of independent operation underwater. It has ballast tanks which are filled with water when it submerges. The submarine can only submerge when it is heavier than water. When the tanks are emptied again, the submarine becomes lighter than water and resurfaces. There are many different kinds of submarines, used for both military, civilian and scientific purposes.

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Answer time 0s (0s). 67% have previously answered correct on this question. The question was created 2012-05-04.