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In the 20th century submarines were used extensively as weapons of war. In the First World War, German submarines, known as U-boats, sank many British ships. Their effectiveness lead to the development of submarines that could remain submerged for long periods of time without having to surface. By 1950, the record was a distance of just____________5, 300 miles. Nowadays, there are nuclear-powered submarines, many of which can travel about 400, 000 miles without having to be refueled.
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