As said before, don't touch any marine life. No animals, no coral no other plants etc. Not only can you damage it beyond repair (there are also oils on your hands that hurt the protective layer of animals such as rays) but you can also hurt yourself. Some aquatic plants or coral are toxic like fire coral. Extremely bad example from Netflix. Besides that I'm a professional diver and their gear was not set up properly and their octo (alternative air source, the yellow hose) was not tucked in properly but was clipped behind their waist belt. Not only is it completely useless this way in case of emergency and can result in potential death of one of the divers, the fact that it is dangling can damage the reef that they are trying to protect. This is literally lesson one. So shame on Zac Efron who is a certified diver (I assume because it looks like it wasn't his first time) so he should know this but definitely shame on the dive operator.