Diving and snorkelling are popular activities, both recreationally and commercially. They are significantly integrated within the Australian tourism and commercial sectors. Typically, scuba diving involves using an underwater breathing apparatus that is usually self-contained but can be from a source at the surface (e.g., hookah). Snorkelling is swimming with the aid of a mask and snorkel and, often, fins.
Generally, the safety requirements for snorkelling reflect many of those for diving, including adequate physical and medical fitness, sufficient skills, and comfort in the water. More snorkellers die nationally than divers, in part due to higher participation, but also because it requires less aquatic training and experience. Due to increases in related drowning deaths, diving and snorkelling have also become a national focus for water safety.