Her sister ships were the Vetehinen and the Iku-Turso. She was ordered 4 March 1927, laid down the same year at the yard of Crichton-Vulcan, Turku, Finland, launched 1 August 1930, commissioned 2 December 1931, decommissioned 1946 and broken up in the fifties. A German design for service in the Baltic with the Russian navy as opponent. She in fact destroyed 21 October 1942 the Russian submarine S-7.
With a displacement of 493 tonnes surfaced and 716 tonnes submerged were her dimensions 63,5 x 6,2 x 3,7 m. The diesel electric engines provided 1.0166 hp allowing a surfaced speed of 12,6 knots and a submerged speed of 8,5 knots, With a speed of 10 knots surfaced her range was 1.575 nautical miles while the submerged range with 4 knots was no more than 75 nautical miles. Her crew numbered 30 men. The armament consisted of 1-76mm gun, 1-20mm gun, 1-12.7 gun and 4-533mm torpedo tubes (two stern, two bow) and transported 6 torpedoes with her; she could also be used for mine-laying.
