The submarine is the fifth Navy vessel to bear the name Idaho. The first was a wooden-hulled storeship commissioned in 1866. The most recent predecessor was the battleship USS Idaho (BB-42), commissioned in 1919, which earned seven battle stars during World War II.

The submarine and crew will complete further tests and trials before commissioning, which is expected in early 2026.

The U.S. operates a fleet of more than 50 nuclear-powered fast attack submarines to counter China's naval threat.

Seoul wants to join the undersea naval elite – and has received the blessing of US President Donald Trump to do just that.

North Korean leader Kim Jong Un oversaw the testing of a new type of high-altitude, long-range missile and inspected work being done to build a nuclear-powered submarine, state media reported, ratcheting up tensions after a US nuclear submarine arrived at the South Korean port of Busan.

Kim Jong Un visited a nuclear submarine facility and supervised tests of new anti-air missiles, criticising South Korea’s US-backed submarine plans and calling faster naval nuclearisation an urgent priority.