Question

what is called submarine?
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Answer 1

Explanation:

submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. ... Submarines were first widely used during World War I (1914–1918), and are now used in many navies large and small.

Answer 2

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A submarine (or sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. ... Submarines were first widely used during World War I (1914–1918), and are now used in many navies large and small.