Russia’s K-329 Belgorod, the largest submarine ever built, resurfaced briefly in the Barents Sea in September 2022 before disappearing from public view just days before the Nord Stream pipeline ...

Most of China's submarine fleet is diesel-electric, but Beijing is ramping up production of nuclear-powered classes.

The Navy is racing to field a new generation of ballistic missile submarines that will eventually rank as the 12 largest boats it has ever operated, aiming to close a looming nuclear deterrent gap as ...