Nice find Von!
As the article is in Russian, here is the translation.
This was a KV-1 which was sunk while crossing the Neva on its way to reinforce the " Невский Пятачок" or " Nevsky Pyatachok ". During the siege of Leningrad this was a small area of about 50 acres completetly surrounded by the Germans. The tank was on 4 wooden rafts trying to cross when hit by enemy artillery. The rafts broke apart and the KV-1 sank ( parts of which were found with the tank).
Here are some sites with some pictures of the area and history.....
http://www.nortfort.ru/np/foto1.html
http://www.oblmuseums.spb.ru/eng/mus...ml#ancContents