A military bunker located near Sosnovy Bor, Russia, part of the VT Line (Vyborg-Tali Line) fortifications built during World War II. The VT Line was a defensive system constructed by Finland along the Soviet border in the Karelian Isthmus, consisting of numerous concrete bunkers, trenches, and artillery positions designed to defend against potential Soviet advances. This particular bunker, designated as a 'финский затопленный бункер' (Finnish flooded bunker), is situated in the Leningrad Oblast region and represents the extensive fortification efforts during the Continuation War period.
The bunker's flooded condition suggests it has been abandoned for decades, with water infiltration likely occurring after the war when the defensive line was no longer maintained.