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Leonardo Da Vinci drew the first drawing of a Submarine.
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In 1578 William Borne began drawing plans for a submarine.
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In 1620 Cornelis Drebbel, a Dutch inventor, built a leather covered rowboat with oars. The oars came out through watertight seals. Twelve people could ride in the submarine.
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Todays Submarines have heavy weaponry on them. They can go down hundreds of feet below the surface, as early submarines could only go a few feet. Todays submarines have moretechnological advances and more amour than older ones. Todays submarines also go alot faster, because its being powered by a engine or propellor, not humans strength.
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