Soviet S-class submarine

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The S class, also known as Srednyaya (Russian: Средняя, "medium"), was a class of medium submarines that were built between 1934 and 1948 for the Soviet Navy. A total of 55 S-class submarines were constructed at various shipyards in the Soviet Union. However, only 40 were completed. They were designed for oceanic operations in the Pacific and Arctic. Unofficially nicknamed Stalinets (Russian: Сталинец, "follower of Stalin"; not to be confused with the submarine L-class L-2 Stalinets of 1931), boats of this class were the most successful and achieved the most significant victories among all Soviet submarines. They sank 82,770 gross register tons (GRT) of merchant shipping and seven warships, which accounts for about one-third of all tonnage sunk by Soviet submarines during the war.