The decision was to use the Ytattack-81 project and modify it for ASW operations, as designing a completely new ship is a time-consuming and costly task. It was given a towed array sonar, ASW torpedoes and the ELMA anti-submarine mortar system. HSwMS Stockholm was launched on 22 August 1984 closely followed by HSwMS Malmö on 23 March 1985, both ships entered service on 1 May 1986.
The choice was to use the Ytattack-81 project and adapt it for ASW operations, as developing a new ship is laborious and expensive. It included a towed array sonar, ASW torpedoes, and the ELMA anti-submarine mortar system. HSwMS Stockholm was launched on 22 August 1984, followed by HSwMS Malmö on 23 March 1985; both ships entered service on 1 May 1986.