The definitive Project 613/Whiskey SSG design was Project 665, known by NATO as the Whiskey Long-Bin (for the enlarged conning tower structure). These were new-construction submarines of a design developed by TsKB-112 under designer B. A. Lyeontyev. Each had four forward-firing P-5/ Shaddock missiles installed in the front portion of the large, bulbous conning tower. The launch tubes were fixed at an upward angle of 14 degrees. From 1961 to 1963 the Gor’kiy yard and the Baltic shipyard in Leningrad together delivered six Long-Bin submarines.