There are pool experiences- closed water, and these are very safe. The discover scuba diving experience in open water is safe if conducted by a trained and insured professional in accordance with agency standards. I do these. I limit students to 2, and depth to 8 meters. The quality and amount of training/orientation varies greatly from place to place and provider to provider. Those in Hawaii are very thorough and safe. The same is not true at all locations in Mexico, though many are just fine. This is one area where credentials and agency affiliation mean something. I don't have personal knowledge of every offering, but have been told that some cruise ship discover scuba excursions at some caribbean islands are pretty sketchy.
DivemasterDennis
DivemasterDennis