on 6 july 1941 "syöksy" and "vinha" sortied to intercept a convoy of three sailing ships headed for hanko. in heavy seas the torpedoes did not function reliably and the boats could not hit their targets. instead "syöksy" dashed past the lead ship and dropped its depth charges in front of it which exploded and sank the sailing ship. both finnish motor torpedo boats escaped unharmed before escorting soviet ships could respond.