No one's exactly sure where it came from, but the ongoing drought has revealed a more than 100-year-old shipwreck that was hidden in the Mississippi River.
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.