A rebreather is not just different kit — it's a fundamentally different way of diving. No bubbles. Near-silent. Extended bottom times on a fraction of the gas. And if you don't understand exactly what it's doing and why, it will kill you. This course teaches you to understand it.
Right, let's have the honest conversation about rebreathers first. CCR diving is brilliant — the extended bottom times, the silence, the fact that you're carrying a fraction of the gas you'd need on open circuit, the way marine life behaves when there are no bubbles. It's a genuinely transformative change to how you experience diving. It's also the piece of diving kit most likely to kill you through complacency or poor understanding, which is exactly why the training matters so much.
The CCR Air Diluent course is your entry point into closed-circuit rebreather diving. Unit-specific — you train on the specific rebreather model you'll be using, not on a generic CCR concept. This matters because every unit is different: different electronics, different scrubber configuration, different bailout procedures, different failure modes. Knowing the theory is necessary but not sufficient. Knowing your unit is the thing.
We dive to 30 metres maximum on air diluent. That ceiling exists because air diluent CCR has oxygen partial pressure implications that limit safe depth, and because 30m on a rebreather with a solidly understood unit is actually a genuinely excellent diving experience. Malta's shallower wrecks — the P29 tops out at 12 metres, the Rozi sits at 34m — are perfectly suited to this level of training. You'll also understand why the depth limit exists rather than just accepting it as a rule.
The course runs 5–7 days and that's not generous — it's what's required to do it properly. Pre-dive checks alone take time to internalise properly. The correct response to a high-oxygen warning takes trained muscle memory, not a think-about-it moment at 25 metres. We build those responses through repetition, in the water, until they're automatic. None of that tick-box nonsense where you read a checklist once and move on.
If you come in not knowing which unit you want to train on, we'll talk through the options. If you already own a unit, we can work with that.
This is unit-specific training. Contact me to discuss which CCR unit is appropriate for your diving goals and budget before booking. Getting the right unit for where you want to go is a conversation worth having early.
CCR Air Diluent is the foundation for all further rebreather training — CCR Decompression Procedures and CCR Mixed Gas / Helitrox both build directly from here. It also opens up a style of diving that experienced open-circuit divers consistently describe as a revelation. The silence alone is worth it. Le Polynesien and HMS Olympus become very different experiences with no bubbles.