Correct, there are no laws about showing certs; but, this is a sign of due diligence on the shop’s part for their protection and the diver’s. Good shops ask— bad shops just want to collect the money.
Per the Nitrox tester on the boat. No one at the shop directed us to the back to test the tanks. They took the money and sent us to the boat. The Captain of the boat thought we’d had tested the tanks at the shop. My point was the poor communication between the captain and shop to dive the divers a chance to test their tanks. But again, good shops test their tanks, direct divers to do the same and have a sign off sheet for divers to assume responsibility for their Nitrox tanks — bad shops don’t give a flip. No laws broken, but when you ignore good practices you wonder what other details have they’ve left out
Yes, the DM tied off on the wreck. There was a mooring block available but he tied off on the infrastructure. I don’t know if he didn’t see it or not. There was a senior Dive instructor with me who lived in FL and mentioned the various violations visiting a historical wreck.