During WWII a boy saw a German tank being driven into a Russian lake. Apparently this was done to prevent it from being captured.
60 years later he was relaying the story to others and it was decided to try and find it. He remembered the location and after some exploration it was found. This video shows it being removed. It was later put into running order, it was very well preserved in the lake because the water was very cold and it was buried in the mud. (only 1 minute long)