North Korea unveiled for the first time a nuclear-powered submarine under construction, a weapons system that can pose a major security threat to South Korea and the US. State media on Saturday ...

By Choe Sang-Hun Reporting from Seoul North Korea said on Saturday that it was building its first nuclear-powered submarine to enhance its nuclear weapons abilities, and the state news media ...

The US Navy wants to mix uncrewed underwater vehicles into its submarine forces. A commander said it's taking a "SpaceX approach" to testing, getting systems out quickly to see what works.