HSwMS Sjöhästen (Shä), Sw. meaning sea horse, was the fifth and last ship of the Swedish submarine class Sjöormen, project name A11.

County Governor Thure Andersson performed the christening, but numerous military and civilian honoratiores did not get to see any submarine leave the slipway.

In addition to County Governor Thure Andersson and his wife, among those present was the "Swedish-American of the Year" Admiral Arleigh Burke and his wife who made a detour to Karlskrona before continuing to Sofiero Palace to be received by King Gustaf VI Adolf.

Among the guests were First Marshal of the Court Admiral Stig H:son Ericson, director (departementsråd) Benkt Dahlberg [sv] of the Ministry of Defence, the Chief of the Defence Staff Lieutenant General Stig Synnergren, and Sten Wåhlin, the director general of the Swedish Defence Materiel Administration.

[2] The submarine served in the Swedish Navy for almost 30 years and was then sold to Singapore in 1997 together with its four sister ships.