The U.S. Navy submarine <a about="#mwt31" data-mw='{"parts":[{"template":{"target":{"wt":"USS","href":"./Template:USS"},"params":{"1":{"wt":"Nautilus"},"2":{"wt":"SSN-571"},"3":{"wt":"6"}},"i":0}}]}' href="https://en.wikipedia.org/wiki/USS_Nautilus_(SSN-571)" id="mwpg" rel="mw:WikiLink" title="USS Nautilus (SSN-571)" typeof="mw:Transclusion">USS<span typeof="mw:Entity"> </span><i>Nautilus</i></a> is commissioned as the world's first nuclear-powered vessel.