Treasure no, not interested in a cavity search after a dive. When you say "recovery" I think of searching for a body. That I have done. Not a pleasant experience, especially when the family is present. That was back when law enforcement didn't have their own dive teams. The one time I was involved was in fresh water in a wildlife management area.
When asked about sharks by female students on their open water dives, I replied "Honey, their are more sharks on this boat than you'll ever see on a dive".
The dive store I worked at in Hollywood, FL had a small store in Marathon. One of the boat captains was the nephew of the owner. Returning from a reef trip, the dive master noticed they were passing some area that he didn't remember. He went to look up at the bridge, only to find the captain missing. Not knowing how to disengage the auto-pilot he fought it all the way on a reverse course. After several miles he came across the captain in the water, red faced and glaring up at him through his coke bottle glasses. After being picked up and resuming a course back to the dock, it was determined that one young lady has slathered up with sun screen, moved to the bow, leaving a good smear of sun screen on the ladder to the bridge. Being the arrogant A-Hole that he was, the captain had used a no rung decent of the ladder, hit the smeared sun screen and lost his grip, falling over board with no one noticing.
What a story - sounds like that Captain is lucky to be alive.
We got our first certification in a quarry in the Midwest which had silos and shafts that were submerged. It was in November when we tested and the water was quite murky. The weekend after we were at a college nearby watching a hockey game with our diving group. The dive instructors got called out over the PA system to report to press area if they were in the ice rink area.
Long story short, another group of divers were doing a night dive at the quarry - something happened to one diver and he lost consciousness, his dive buddy inflated his BCD only to shoot up fast and hit the shaft. At least, that is the story we were told. Unfortunately, our instructors were called in to assist with recovery. What a sad night.