You're doing well Elbert. I had two digital camera housings flooded by customers, and I think both had tried to open the housings. Another flooded because I simply prepped it too quickly and didn't microscopically examine the closure for signs of grit and hair. Another that I sold to a friend flooded on her 6th or 7th dive with it, for the same reason as mine - rushed preparation. And a professional videographer on my boat found his housing open at the bottom of the rinse bucket after the dive. That cost a fortune, as the housing was all-electronic and it was destroyed along with the camera. A message we received later suggested it had been a malicious act by a diver on the boat. Nonetheless, cost me several thousand US$.
Another diver with one of my rented cameras, who had received a thorough briefing on how to use and care for it (from me), climbed the boat ladder at the end of a dive with the camera dangling from his wrist and banging into everything nearby. The camera in that case wasn't damaged, but the housing was cracked and destroyed. He also claimed it wasn't his fault, but I made sure he paid for a new housing.
As to dive lamps, an unmitigated disaster. I watched one of my divers unscrew the end of one of my lamps underwater so that the contents fell out onto the bottom of Hol Chan. He later said "it wasn't his fault, he was trying to turn it on/off". I lost four lamps on a single dive once, all flooded.