K-278 Komsomolets was the only Project 685 Plavnik, nuclear-powered attack submarine of the Soviet Navy. On 4 August 1984 K-278 reached a record depth of 1,020 metres (3,350 feet) in the Norwegian Sea. Although it was developed mostly to test technology for fourth-generation nuclear submarines, it was fully combat-capable. It sank on its first operational […]
