When I was in Las Vegas a couple of years ago, I bought a book about many of the shows in town and one of the shows was O. It said all of the performers are open water certified and there are several safety divers that assist the performers for each show. From what I could tell, it sounds as if some of the diving is done with hookahs, much like what aquarium divers sometimes use. The safety divers probably use scuba tanks, however. I want to see this show sooooo bad, but the tickets are outrageously expensive. :frown:
Being one of the safety divers would be an awesome job, though... :biggrin2: