We have, I think everybody thats been diving very long have had at least one bad experience. The last one I remember was with a Divemaster that was non interested in doing his job. I paid for a Divemaster for my son because we were an odd number. He did not stay close or check air. He thought the safety stop was unnessisary. We made the safety stop. My son ended up with me and my buddy and we made the safety stop without him.