Zapadnaya Litsa
K-50 was laid down on 14 February 1963 (using some mechanisms and equipment from unfinished submarine of project P627A), launched on 16 December 1963, and commissioned 17 July 1964. K-60 entered service with the Northern Fleet (given to 3rd division of nuclear submarines which was a part of 1st submarine flotilla, based in Malaya Lopatka of Zapadnaya Litsa Fjord) on 6 August 1964. The submarine was given to 17th submarine division based in Gremikha in 1969 (17th submarine division became a part of 11th submarine flotilla in 1974).