The K-456 Vilyuchinsk (ex Kasatka) is a Russian Oscar class SSGN of the Russian Navy. It was commissioned in 1991 as part of the Russian Northern Fleet and was transferred to the Russian Pacific Fleet in September 1993. The submarine is currently based at the Rybachiy Nuclear Submarine Base, in Vilyuchinsk, near Petropavlovsk-Kamchatsky.