Did you know an estimated 6,000 ships have sunk on the Great Lakes? Just this last year several were found, and National Geographic did a great job covering the historic finds.
The fact that there are shipwrecks in the Great Lakes is not news. I don't know of any bodies of water in the world that have more than that region. However, I did not realize that there is (kind of) a Nazi shipwreck in Lake Michigan - until now.