Scuba diving is one of the world’s most popular adventure activities, with the largest training organization PADI issuing an average of 900,000 diving certificates each year (Professional Association of Diving Instructors [PADI], 2016a). Estimates suggest that there are up to 6 million active divers globally (Diving Equipment and Marketing Association [DEMA], 2017). Participants range from age 12 upwards, with the highest proportion of active divers in the 38–53 years age range. Although there are different views about how many dives per year it takes to be “active,” it is clear that many people only dive on their vacations (Coghlan & Prideaux, 2008; Wilks & Atherton, 1994). In tourist destinations like Queensland, especially on the Great Barrier Reef, up to half of the approximately 1.2 million diving trips and 2.3 million snorkeling trips each year are undertaken by overseas visitors (Ministerial Reference Group, 2011).