What kind of vessel is suitable for sailing under water?

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What kind of vessel is suitable for sailing under water? A submarine

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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