North Korea on Thursday unveiled the completed hull of what it described as a nuclear-powered submarine, signalling progress in one of leader Kim Jong Un’s top weapons projects, even as Pyongyang ...

Last year, a Russian “shadow fleet” vessel transported two submarine nuclear reactors to an uncertain destination in the Far East—but it never arrived. Rumors abound about the true extent and nature ...

The mystique of nuclear-powered submarines has been captured by at least half a dozen popular Hollywood films. Some have centered on the drama of undersea warfare and the risk of global nuclear ...