The fourth Nautilus, was the first nuclear powered submarine and the first submarine to voyage under the Arctic polar ice pack.
In recognition of her pioneering role in the practical use of nuclear power, Nautilus was designated a National Historic Landmark by the Secretary of the Interior on 20 May 1982.
Following an extensive historic ship conversion at Mare Island Naval Shipyard, the submarine was towed to Groton, Connecticut, arriving on 6 July 1985. There, on 11 April 1986, eighty-six years to the day after the establishment of the U.S. Submarine Force, historic ship Nautilus and the Submarine Force Museum opened to the public as the first exhibit of its kind in the world.
The unique museum ship continues to serve as a dramatic link in both Cold War-era history and the birth of the nuclear age.