A submarine is a watercraft that travels underwater. It is often used for marine exploration, research, or military purposes. Submarines have special engines that can submerge and resurface, allowing them to navigate beneath the surface of the water.
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submarine, any naval vessel that is capable of propelling itself beneath the water as well as on the water's surface.
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A submarine is a watercraft that travels underwater. It is often used for marine exploration, research, or military purposes. Submarines have special engines that can submerge and resurface, allowing them to navigate beneath the surface of the water.