Technical training

Closed Circuit Rebreather Diver

Recycling breathing gas to extend duration, reduce bubbles and optimise oxygen exposure.

Closed-circuit rebreathers recycle breathing gas and continuously manage the breathing loop's composition, removing carbon dioxide with a scrubber and adding oxygen as it is consumed.

The benefits are substantial: long gas duration largely independent of depth, near-silent operation with minimal bubbles, warm moist breathing gas and an optimised oxygen partial pressure throughout the dive.

The risks are equally real and are different in kind from open-circuit diving. CCR training is unit-specific, and so is the support a dive centre can provide.

Technical wreck diving, represented by an AI-generated editorial image.

Track	Technical
Prerequisites	Advanced Nitrox and Decompression Procedures typically required; Substantial technical experience; Unit-specific training
Agency equivalents	TDI: CCR Diver · PADI: Rebreather Diver · IANTD: CCR Diver · RAID: CCR

What it teaches

loop assembly, pre-breathe and pre-dive checks
oxygen partial pressure monitoring and manual control
scrubber packing, duration and monitoring
diluent management and depth limits
bailout planning and execution
failure recognition and response

The risks are different, not merely greater

Open-circuit diving fails obviously — a regulator free-flows, a cylinder empties. Rebreather failures are frequently silent, and the diver may feel fine while the loop becomes unbreathable.

hypoxia from insufficient oxygen addition
hyperoxia from excessive oxygen
carbon dioxide buildup from scrubber exhaustion or channelling
oxygen sensor failure or drift
loop flooding
electronics failure

Support is unit specific

CCR support is not a single capability. A centre may service one manufacturer's units, stock a particular sorb, and have instructors qualified on specific models.

A centre page should name supported units where possible, because a rebreather diver arriving with the wrong unit has no support at all.

Where this qualification matters in Australia

Sites where holding this certification genuinely changes what you can do — not a list of everywhere it is accepted.

Ships' GraveyardNumerous vessels deliberately scuttled outside Port Phillip Bay across a wide depth range.Port Phillip Heads WallsWalls starting at 12 metres and continuing beyond 90 — the terrain behind Victoria's technical culture.Tank CaveOne of the longest underwater cave systems in Australia — advanced CDAA qualification only.SS NordA steamer lost in 1915, lying around 42 metres off the Tasman Peninsula.

Natural next steps

Courses that build directly on this one.

Trimix DiverAdding helium to manage narcosis, oxygen exposure and gas density at depth.Cave DiverFull overhead penetration diving, where direct ascent is not available at any point.

Courses that lead here

Cave DiverFull overhead penetration diving, where direct ascent is not available at any point.Advanced NitroxHigh-oxygen decompression gases and oxygen-clean equipment — not ordinary recreational Nitrox.Decompression ProceduresPlanning and executing dives with a mandatory decompression obligation.Trimix DiverAdding helium to manage narcosis, oxygen exposure and gas density at depth.

Agency versions of this course

The same qualification under different names. All are mutually recognised by operators.

TDITaught as “CCR Diver”.PADITaught as “Rebreather Diver”.IANTDTaught as “CCR Diver”.RAIDTaught as “CCR”.

Centres documented as offering this level of training

Businesses where the relevant capability is verified or advertised. Always confirm the specific course directly.

Dive Dive DiveA long-standing Brisbane business associated with technical training alongside recreational courses, retail and servicing. Technical capability should be audited service by service rather than assumed.Dive Centre ManlyA Northern Beaches operation with a long-standing presence at Shelly Beach, offering recreational training, boat diving and technical pathways.Frog Dive SydneyA long-established Sydney business associated with recreational and technical training alongside retail and workshop services.Abyss Scuba DivingA Sydney operation associated with training across recreational and technical levels, boat diving and equipment services.Dive Centre BondiAn Eastern Suburbs operation providing recreational training, local diving and technical pathways.Academy of ScubaA Melbourne training business offering recreational courses with technical pathways.Diveline Scuba CentreA Victorian business associated with technical training and gas support alongside recreational courses.AquabilityA Victorian operation associated with technical diving training. Exact agency, course levels and gas support require verification.Bay City ScubaA Victorian business associated with recreational and technical training alongside equipment and gas services.Ocean DiversA Victorian operation associated with recreational and technical training and access to Port Phillip diving.Snorkel & Dive Safari AltonaA Melbourne retail and training business, listed among Victorian operations associated with technical services.All About ScubaA Victorian training operation listed among those associated with technical diving. Capability requires verification.

Frequently asked questions

Is a rebreather worth it for recreational diving?

For most recreational divers, no. The cost, maintenance burden and training commitment are substantial, and the benefits are most valuable on long, deep or wildlife-sensitive dives.

Can I get sorb and support anywhere in Australia?

Support is concentrated in the major cities and specific technical centres, and is unit-dependent. Confirm both sorb availability and unit support before any trip.

Which unit should I train on?

Consider what your local centre supports and services, because ongoing support matters more than the initial purchase decision.