From scubaclay: When we talk about dive etiquette we are not only talking about keeping off the bottom. I get so frustrated when another instructor swims his class through the middle of my class, or a group of divers lounge around the entrance and exit points talking about their dive when other divers are trying to get into or out of the water. This is also a part of etiquette. More importyantly it is common respect for the other divers.