​North Korea Unveils the Completed Hull of What It Calls a Nuclear Submarine

The debut followed the North’s first test of a new surface-to-air missile and the arrival of a U.S. nuclear-powered attack sub for a port call in South Korea.A photograph provided by North Korean state media on Thursday showed the North Korean leader Kim Jong-un visiting the manufacturing site of what it said was a nuclear-powered submarine, at an undisclosed location.