The ''Hajen'' class (Shark class) was a

submarine A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...

class built by

Kockums Saab Kockums AB is a shipyard headquartered in Malmö, Sweden, owned by the Swedish defence company Saab AB. Saab Kockums AB is further operational in Muskö, Docksta, and Karlskrona. While having a history of civil vessel construction, Kocku ...

and used by the

Swedish Navy The Swedish Navy () is the maritime service branch of the Swedish Armed Forces. It is composed of surface and submarine naval units – the Fleet (), formally sometimes referred to as the Royal Navy () – as well as marine units, the Amph ...

. The design was influenced by the German

Type XXI submarine Type XXI submarines were a class of German diesel–electric '' Elektroboot'' (German: "electric boat") submarines designed during the Second World War. One hundred eighteen were completed, with four being combat-ready. During the war only two w ...

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 in 1954, followed by (1955), (1955), (1957), (1958), and (1958).

References

* Conway's All the World's Fighting Ships 1947-1995 Submarine classes {{submarine-stub