The Yankee class is the NATO classification for a type of nuclear-powered submarine that was constructed by the Soviet Union from 1968 onward. 34 units were produced under Project 667A Navaga (after the fish) and Project 667AU Nalim ("burbot"). 24 were built at Severodvinsk for the Northern Fleet while the remaining 10 built in Komsomolsk-na-Amurye for the Pacific Fleet. Two Northern Fleet units were transferred to the Pacific. The lead unit K-137 Leninets, receiving its honorific name 11 April 1970, two and one half years after being commissioned.