Tanks from the Second World War are still being pulled out of the lakes around St. Petersburg. If I remember my history correctly, the city was resupplied across the frozen lakes during the winter phases of the siege and at times the ice broke. The site refers to it as a “BT” tank. You can get BT5 or BT7 tanks in 1:35th scale from Zvezda, or BT5, BT7 or BT2 from Unimodel in 1:72nd. A salvage operation like this would make for an interesting diorama.