Minelayer Ruotsinsalmi SA-kuva
Funding for two new minelayers had been secured as early as in 1937, but instead the money was used to refurbish the garrison at Mäkiluoto.
Ruotsinsalmi and her sister vessel, Riilahti, were intended as escort minesweepers for the Finnish navy's coastal defence ships Ilmarinen and Väinämöinen, and they were therefore designed with a draft of only 1.5 m. Ruotsinsalmi was armed with one 75 mm gun, one Bofors 40 mm guns and two Madsen 20 mm anti-aircraft cannons. The vessel had three mine dropping rails, and could carry about 100 mines. The ship could also hunt submarines, and was equipped with sonar, depth charge throwers and rails. The vessel was also strong enough to be able to tow mine sweeping equipment. It was equipped with smoke generators so it could protect itself and other near-by vessels from the enemy.
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