"Stalinets" tractors were produced in 1937-1941 in Chelyabinsk for industrial and construction works. But they were also often used by the Red Army as a prime mover.
This "Stalinets" tractor sank in winter 1942 in Usoditsa lake of the Zapadnodvinsky district of the Tver region, Russia. It was repeatedly searched and when was finally found there were some attempts to pull it out. But it was not easy. The tractor was under the marsh bog.
However the last attempt made by the volunteers together with the Russian Ministry of Defence and the Moscow search and restoration center "Rearguard", divers from Pskov and other specialists finally managed to pull the tractor out.