In 1900 the US Navy took into its first submarine, the Holland VI, into service. With a single torpedo tube, it had a crew of six, weighed 82 tons and traveled submerged at 6.2mph at a depth of up to 75 feet.
Contrast this to the 18 Ohio Class nuclear-powered submarines which entered service in 1981. Weighing 21,000 tons with a crew of 155, its underwater speed is estimated at 30mph at a depth of some 1,000 feet. It carries 16 nuclear warhead...
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