HSwMS Hajen (Hj, later Haj; lit. 'shark') was the lead boat of the Hajen-class submarine of the Swedish Navy.
Construction and career Hajen was launched on 11 December 1954 by Saab Kockums, Malmö and commissioned on 28 February 1957.
She was decommissioned on 1 July 1980 and later scrapped in Landskrona in 1983.
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