HNLMS Zwaardvis (S806) (Dutch pronunciation: [ˈzʋaːrtfɪs] ⓘ; English: Swordfish) was a Zwaardvis-class submarine of the Royal Netherlands Navy.

[5][6] On Friday morning, August 18, 1972 the HNLMS Zwaardvis was transferred by RDM to the Royal Netherlands Navy and put into service.

[citation needed] The ceremony took place at crane track 13, where the Dutch Navy's latest acquisition was moored.

Mrs J. den Toom - Niessink, who baptized the Zwaardvis on 2nd of July 1970, also gave an appearance at the time of commissioning.

[6][7] From August until September 1977 Zwaardvis, Dolfijn, the tender Mercuur and Onondaga performed torpedo firing exercises off the coast of the United Kingdom.