In 1951, the unit was assigned its current name, and was part of the Coastal Fleet as the 1st Submarine Flotilla.

On 1 July 1994, the flotilla was organized as the First Submarine Department (Första ubåtsavdelningen, 1. UbA).

This because all units within the Swedish Armed Forces were cadre organized, and got a permanent organisation.

Parts of the submarine force were included in the Gothenburg Squadron and the Karlskrona Department (Karlskronaavdelningen) during World War II.

[9] It was presented to the then 1st Submarine Division by the Supreme Commander, General Owe Wiktorin at the Artillery Yard in Stockholm on 30 April 1996.