Submarine - Wikiwand

A submarine is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term is also sometimes used historically or colloquially to refer to remotely operated vehicles and robots, as well as medium-sized or smaller vessels, such as the midget submarine and the wet sub. Submarines are referred to as boats rather than ships irrespective of their size.

James Madison-class submarine - Wikiwand

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From Wikiwand: Kursura as a museum ship in Visakhapatnam.

Narco-submarine - Wikiwand

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Sailfish-class submarine - Wikiwand

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Rubis-class submarine - Wikiwand

German submarine U-37 (1938) - Wikiwand