This case is about a firefighter who died while doing dive training.
This case is about Robert S. Scuba who was convicted of robbery.
I searched CA, FL, and MI state and federal cases, including circuits with various combinations of "scuba" and a modifier, including: wrecks, death, died, liab! (all words with the root liab, so it includes liability, liable, etc.), private, and a few others. Came back with nothing. Not a single case that involving your situation. Lots of cases suing dive operators, instructors, a couple of dive buddies, etc, but nothing on the liability of the organization that sunk a wreck. As a matter of fact, the few "scuba" and "wreck" results that were returned all had to do with salvage rights. I'll keep looking but I doubt I'll find anything.
CA and FL have "recreational use" statutes, but nothing scuba specific like MI.