|Completed||1916 - Kolomna Shipyard, Moscow|
|Date of attack||12 Jan 1945||Nationality: Finnish|
|Fate||Sunk by U-370 (Karl Nielsen)|
|Position||59° 40'N, 23° 05'E - Grid AO 0253|
|Complement||41 officers and men (10 dead and 31 survivors).|
Built as Russian Voin and taken over as M-1 by Finland when the country declared independency in 1918. 1936 renamed Louhi.
On 3 Jan 1940, the S-2 hit a mine and sank off Märket lighthouse, Åland Islands. The minefield of 190 mines had been laid by Louhi in December 1939.
|Notes on event|
At 11.50 hours on 12 Jan 1945, an explosion occured under the Louhi that was returning with the Finnish minelayer Ruotsinsalmi from the minelaying operation Vantaa 3 south of Russarö under escort of two Soviet MO-class submarine hunters. The ship sank within two minutes and the survivors were picked up by the escorts shortly thereafter. A long time it was believed that the vessel probably hit a mine from a deep laid Soviet barrage in the area because no German claim could be found. But years later the wreck was located in a depth of 40 meters and shows signs of a torpedo explosion. U-370 had reported an unsuccessful attack with two Gnats on a group of warships in the area on that day, so it is very likely that one of the Gnats had in fact hit the minelayer.
This was the last U-boat success in the Baltic Sea. The mine barrage Vantaa 3 consisted of 160 mines in two lines and in the following weeks U-745 (von Trotha) and U-676 (Sass) were both lost with all hands after hitting mines south of Hanko.
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