BTW, I recently finished a week of diving in Tulamben, Bali. Our group of 3 people was assigned to a specific DM for the week. When we signed up, we all accurately filled out the forms identifying our certification levels. On the first dive, our DM said we would be diving to 20 meters/80 feet. I did not correct him. We dived to 20 meters. I thought, "OK, if that's where the good stuff is on that dive, that's fine." On the next dive he repeated the briefing, and I did correct him this time, telling him that 20 meters is 66 feet. As the week went on, it became pretty clear that he was never going to go below 20 meters, and he never did. On some sites that was just fine, but at other sites it was not. I finally went where I felt like, which concerned him.
After one dive, he said, with near terror in his voice, "You must have gone below 80 feet on that dive!" I told him I had in fact gone to 103 feet. I then reminded him that my two friends were deep diver certified, meaning they had been trained to 40 meters/130 feet. I told him that when I got back in the states, I would be certifying divers to go to 300 feet. (And I just did that yesterday.) None of that mattered. With him leading the dives, we were not going to be led below 66 feet. If we went away from him and descended to depths as dangerous as 80 feet, well, we were doing so at our own peril.