Lots of interesting wrecks out there. The wreck of the USS Monitor was used as a target for depth charge training during WWII...
Thats pretty interesting! On lake Michigan theres a WWI U-boat (no, not theU505) that was a war prize and it was used for gunnery practice off Great Lakes Naval Air Station. Lots of weird stuff below... ws https://ss.sites.mtu.edu/mhugl/2016/10/14/german-submarine-uc-97/
Fascinating story. There are many WWI U-boat wrecks out there, but this one must be the only one in a good state of preservation. Too bad the Glomar Explorer was scrapped This came to mind - The oldest Royal Navy submarine... Sadly with an uncertain future: https://www.nauticalarchaeologysociety.org/holland5-dive-trail