Cave Diving Etiquette Interview with Terrence Tysall. Terrence is an renown Explorer, Tech Diving Instructor and is currently the VP of Operations at NAUI Worldwide. We talk about how since the sport of Cave Diving has grown the basics of diving etiquette have seemed to slip. In full disclosure Terrence was also MY cave diving instructor. Important UPDATE: Pod Diver Radio is now on Instagram. find us and follow us at @poddiver