Soviet submarine Project 628

In 1952-1953 design efforts began on Project 628, an updated Soviet XIVseries (K-class) submarine configured to conduct experimental launches of the 10XN Volna (wave) subsonic cruise missile.
This missile – developed by Chelomei's design bureau – was powered by twin ramiets; the missile was launched from a ramp with the aid of single booster rocket.
Although Western intelligence reported launchers installed near Leningrad and Vladivostok for this missile, it did not enter ground or naval service. It was rejected for naval service because of guidance limitations, the high fuel consumption of available ramjets, and the ongoing development of supersonic missiles.
Aversions of the 10XN enter service with the Soviet Air Forces in 1953

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