Saukko (Finnish for European otter) was a Finnish submarine launched in 1930. Designed to operated from Lake Ladoga, her tonnage was limited to 100 tonnes by the Treaty of Tartu. In reality, she weighted 114 tonnes and never operated from the lake.
To enable rail transportation, she was able to be separated into several sections, including the removal of the conning tower.
During the Winter War (1939–1940) and the Continuation War (1941–1944), the submarine operated in the Gulf of Finland. Saukko was scrapped in 1952.
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