I guess I'm jaded by my years on Saipan where most of the tourists are Japanese on a three day holiday. So many of them do their intro dive course in that time, get certified and then don't dive again until next year's three day vacation. They never really develop dive skills and some of them can barely swim, yet they're taken on difficult dives like The Grotto which can be deep and overhead. It's frightening to watch them dive.