January 21, 1954 - The first atomic-powered submarine, the USS Nautilus, built by Electric Boat Company, was launched at Groton, Connecticut. All previous submarines were powered by batteries which had to be periodically recharged by diesel-powered generators which could only run if the sub surfaced.
The nuclear power plant, developed under the leadership of Captain Hyman Rickover, and its ability to produce its own fresh water, allowed Nautilus and its successors to remain underwater and undetectable for weeks rather than hours. It carried only conventional torpedoes.
It has been completely restored and can be seen at the Submarine Force Museum in Groton.
