Not only did these two dolphins make us divers squeal with excitement when they buzzed around us, they also absolutely freaked out all fish life including the Grey Nurse Sharks! Every single fish took cover in cracks in the rock until the hunting was over and the dolphins disappeared. The vis was around the 15-20m mark, so this fast chain reaction was an amazing thing to watch. Interesting that the Grey Nurse at nearly the same size (one of the dolphins was huge!) did the same!