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Submarine Day
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A submarine is a vessel designed for underwater operations that can still sail on the water's surface. Aristotle described a submersible used in 332 B.C. by the sailors of Alexander The Great. There is also evidence that a primitive sub was built around 200 B.C. in China. It was centuries later before the first real sub was built in 1620 by a Dutchman (of wood encased in leather). From these beginnings, we have progressed to the nuclear powered subs that sail today.
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