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Submarines R-class 1918 Miniature Souvenir Sheet Stamp Mint NH famous discoveries stamps Rwanda Fish Marine Fauna SouvenirSubmarines R class 1918 Miniature Souvenir Sheet Stamp Mint NH A submarine (or simply sub) is a watercraft capable of independent operation underwater. It differs from a submersible, which has more limited underwater capability. The term most commonly refers to a large, crewed vessel. It 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