B-39 was a Project 641 or "Foxtrot" class diesel-electric attack submarine of the Soviet Navy. B-39 was commissioned on 28 December, 1967, and decommissioned on 1 April, 1994. B-39 was homeported in Vladivostok, and conducted patrols in the North Pacific, Indian and Artic Oceans, and along the Pacific coasts of the United States and Canada.

"Foxtrot" class submarines, like previous Soviet diesel-electric submarines, were based on the German WWII era Type XXI ("Elektroboote") U-boat design.

--source: Wikipedia and the San Diego Maritime Museum.