Soviet submarine L-21

The World War II Soviet submarine L-21 belonged to the L-class or Leninets class of minelayer submarines. She was part of the last series (Group 4) of her class, having some improvments including more torpedo tubes. The commander during the war was Sergey S. Mogilevskiy

Service history
Before completion, L-21 was sunk by German aircraft in Leningrad on 24 May 1942. L-21 was later raised, completed and commissioned, making both torpedo attacks and mine-laying. Among her victims was the Hansa, a neutral passenger ship. L-21 also managed to sink a number of German warships.

One of her mines heavily damaged the German destroyer Z-43.