The Leninets or L class were the second class of submarines to be built for the Soviet Navy. Twenty-five were built in four groups between 1931 and 1941. They were minelaying submarines and were based on the British L-class submarine, HMS L55, which was sunk during the British intervention in the Russian Civil War. Some experience from the previous Dekabrist-class submarines was also utilised. The boats were of the saddle tank type and mines were carried in two stern galleries as pioneered on the pre-war Russian submarine Krab (1912). These boats were considered successful by the Soviets. Groups 3 and 4 had more powerful engines and a higher top speed.

Ships

Group 1

Six ships were built (L-1 to L-6), all launched in 1931. Three were assigned to the Baltic Fleet and three to the Black Sea Fleet, including Soviet submarine L-3.

Group 2

Six ships were built (L-7 to L-12) and launched between 1935 and 1936. All were built for the Pacific Fleet by plant 202 "Dalzavod" Vladivostok and plant 199 Komsomolsk-na-Amure.

Group 3

Seven ships were built (L-13 to L-19) and launched from 1937 to 1938. All were assigned to the Pacific Fleet. Considered a new project, the hull was based on the Srednyaya class. They carried 18 mines.

Group 4

6 ships were built (L-20 to L-25) and launched from 1940 to 1941. 3 were assigned to the Baltic Fleet and 3 to the Black Sea Fleet. This group added stern torpedo tubes and new, more powerful diesel engines.

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