Cave diving is a separate discipline rather than an extension of recreational or even technical open-water diving, and its defining feature is the absence of direct ascent.
Everything else follows from that single fact: continuous guideline, conservative gas rules, redundant gas and lights, silt management, restriction technique and complex navigation.
In Australia, cave diving centres on the limestone of South Australia's Lower South East — Tank Cave, Piccaninnie Ponds, Kilsby's and many others — where access is governed by the Cave Divers Association of Australia.
What the course covers
- continuous guideline procedures and line laying
- lost line and lost diver protocols
- gas rules such as the rule of thirds and beyond
- light failure procedures with full redundancy
- silt management and precise propulsion technique
- restriction technique and equipment configuration
- complex multi-branch navigation with markers
Recreational certification is not cave certification
A standard Open Water, Advanced or Deep certification does not prepare a diver to enter an overhead cave environment. This is not caution — the failure modes are genuinely different.
A diver who loses gas in open water ascends. A diver who loses gas in a cave has a distance problem, not a depth problem.
The CDAA governs Australian access
The Cave Divers Association of Australia operates the site classification system that determines which qualifications permit access to which sites, and membership is generally the mechanism by which access is granted at all.
The system exists because of a history of fatalities in the region, and the rules are specific responses to how those incidents happened.
Common questions
Can I cave dive in Australia with an overseas cave certification?
CDAA recognises certain external qualifications for equivalence, but site access still runs through the CDAA system. Check the current arrangements before travelling.
Do I need sidemount for cave diving?
It depends on the site. Restrictions in systems like Tank Cave make sidemount configurations common, while more open systems accommodate backmount twinsets.