Question

What is submarine ??????​

Answer 1

Answer:

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.

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Answer 2

Answer:

Submarine, any naval vessel that is capable of propelling itself beneath the water as well as on the water's surface. This is a unique capability among warships, and submarines are quite different in design and appearance from surface ships.