Finnish Navy and IvS
During 1920s Finland’s navy was very small. The new navy was gradually started to be developed in 1927.
From the beginning it was clear that submarine flotilla was needed as the offensive part of a modern navy. Finns knew well that the best submarine designers were in Germany.
Because the Peace Treaty of Versailles denied the Germans to use, build or even to design submarines, the German Navy Reichsmarine secretly established a design bureau called Ingenieurskantoor voor Sheepsbouw (IvS) in Netherlands.
In co-operation with IvS, Finnish dockyards built up three Vetehinen-class submarines and one small Saukko-class boat during 1927-31.
Submarine Vesikko the first and the last U-Boot Typ II