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Hajen-class submarine Wikipedia
The Hajen class (Shark class) was a submarine class built by Kockums and used by the Swedish navy. The design was influenced by the German Type XXI submarine class. A total of 6 submarines were built in 1954-1958 and were kept in service until 1980.
The first Hajen class submarine to be built was HMS Hajen in 1954, followed by HMS Sälen, HMS Valen (1955), HMS Bävern (1958), HMS Illern (1957) and HMS Uttern (1958).