Pillaging documented sites should bring down the full force of the law,
I believe that any artifact found should be brought up, conserved and displayed. leaving them in place so a few tourists snorkeling can get a
thrill is a bunch of bull. replace them with replica's and preserve the originals.... stop thinking about all the tourist dollars spent.
There is at least one NPS site off Florida where they have placed repro cannon for the diving public to find and see.