What was the first nuclear-powered submarine?
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The first nuclear-powered submarine, USS Nautilus, put to sea in 1955. This marked the transition of submarines from slow underwater vessels to warships capable of sustaining 20-25 knots submerged for long periods, independent of needing air for diesel engines to charge batteries.
The first nuclear-powered submarine was U.S.S. Nautilus.
It was launched in Groton, CT, on Jan. 21, 1954, and entered Navy service in September that year.
Construction of Nautilus was made possible by the successful development of a nuclear propulsion plant by a group of scientists and engineers at the Naval Reactors Branch of the Atomic Energy Commission, under the leadership of Captain Hyman G. Rickover, USN.