"....In eastern Estonia, the 50 kilometer wide Narva front was the location of fierce battles fought from February to September 1944. An estimated 100,000 men were killed and more than 300,000 wounded during these battles. It is thought that the Germans used this tank and then drove it into a lake to prevent it from being retaken and used by the advancing Soviet army."
Note the fuel tanks seem to be missing .... retreating Germans couldn't waste fuel.