Golf I & II (Project 629)

Project 629, known to NATO as the Golf class, was a Soviet diesel-electric ballistic missile submarine program. It predated large-scale Soviet nuclear SSBN deployment and gave the navy a sea-based ballistic missile capability using conventional propulsion. Golf I and Golf II variants reflected early efforts to adapt submarine hulls to carry submarine-launched ballistic missiles.

Golf-class boats carried three ballistic missiles in a sail-mounted missile compartment while retaining torpedo tubes for self-defense. Early launch systems required surface or near-surface procedures, while later variants improved missile fit and range. The design was a bridge between experimental sea-based missiles and more survivable nuclear-powered SSBNs.

The class served in Soviet strategic forces and was exported or transferred in limited forms, including influence on Chinese and North Korean submarine missile development histories. Its vulnerability compared with nuclear SSBNs does not erase its importance: it was one of the first practical operational steps toward submarine-launched nuclear deterrence.