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 ...

Summary and Key Points: The U.S. Navy’s Columbia-class ballistic missile submarines are designed to replace the aging Ohio-class and sustain America’s most survivable nuclear deterrent for decades.

The United States remains the world's leading operator of nuclear submarines, including fast-attack, ballistic-missile, and guided-missile types. However, the most significant shift in the undersea ...