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A submarine is a class of ships capable of submerging and for a long time operating in an underwater position. Until 1944 all the submarines spent most of the time in the surface position and in fact were boats surface ships capable of submerging under water for attack during daylight hours or for hiding from enemy ships.
Submarines form the basis of the navy of the armed forces of many states. The most important tactical property and advantage of a submarine is secrecy. This is especially important for a military.
The idea of combat use of a submarine was first voiced by Leonardo da Vinci. Subsequently he destroyed his project because he feared the devastating consequences of the war.
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