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submarine is a watercraft capable of independent operation under water. It differs from a submersible, which has more limited underwater capability. The term submarine most commonly refers to large crewed autonomous vessel. however, historically or colloquially, submarine can also refer to medium sized or smaller vessels. Submarines are used for tourism, undersea archaeology, military etc. Civilian uses for submarines include marine science, salvage, exploration and facility inspection/maintenance. Submarine can also be modified to perform more specialized functions such as search and research mission or undersea cable repair.
Most large submarine consist of a cylindrical body with hemispherical ends and vertical structure, usually located amidships, which houses communications and sensing devices as well as periscopes.
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| Submarine |
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| Automatic Submarine |
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