CCR Fundamentals
- JJ-CCR
- Available
- Symbios CCR
- Available
GUE CCR training for divers ready to extend their technical diving capability, with training on JJ-CCR and Symbios CCR.
CCR isn't simply a way to go deeper. For many technical divers, it changes what is practical to plan and execute.
As open-circuit dives become deeper and longer, helium consumption becomes a significant part of the cost and logistics. This is particularly relevant when planning repeated dives or expeditions in locations where helium is difficult to obtain.
A CCR uses substantially less helium during the dive than an equivalent open-circuit configuration. For divers regularly undertaking deeper or longer dives, that can reduce gas logistics and make some dive plans more practical. It does not make CCR the cheaper or simpler choice for every diver: the unit itself, training, maintenance and additional procedures all need to be considered.
CCR isn't automatically the right choice for every diver or every dive. It is another tool for technical divers who want to extend what they can do underwater.
The gateway to GUE CCR training
CCR Fundamentals is the first class in the GUE CCR pathway. It introduces the skills, procedures and approach needed to operate a closed-circuit rebreather within the GUE system, providing the foundation for progression into CCR Technical Diver 1.
GUE CCR Fundamentals →Progressing into technical CCR diving
CCR Tech 1 builds on CCR Fundamentals and develops the skills needed for deeper technical rebreather diving, including the planning, gas management, decompression and team procedures required for more demanding dives.
GUE CCR Technical Diver 1 →Advanced CCR technical diving
CCR Tech 2 builds on CCR Tech 1, extending the range and complexity of technical CCR diving. The class develops the skills, planning and team procedures required for deeper dives, longer decompression obligations and more complex technical dive profiles.
GUE CCR Technical Diver 2 →I offer GUE training on both rebreathers.


These resources provide additional unit-specific information for divers considering Symbios, planning GUE training on it or returning to skills they already hold.
An independent, experience-based introduction to the unit, its chest-mounted configuration and the questions worth considering before choosing it.
Explore the Halcyon Symbios CCR →How the Symbios fits into the GUE CCR pathway, from CCR Fundamentals into technical rebreather training.
Explore GUE Symbios training →An independent one-day session for qualified Symbios divers who want to revisit critical knowledge, procedures and in-water skills.
Explore the Symbios tune-up day →The independent Symbios CCR Tune-up Day combines guided discussion with focused in-water practice for qualified Symbios divers who want to refresh critical knowledge and procedures.
My involvement with GUE CCR goes beyond teaching the courses.
I've been diving rebreathers since 2014, with experience on RB80, JJ-CCR, Divesoft Liberty and Symbios.
I'm a GUE Instructor Evaluator for both JJ-CCR and Symbios, and a factory trainer for Symbios. I was the first instructor to teach Symbios and have been involved in its development since the unit was first made public.
I'm also involved in the development, writing and review of GUE training materials for both JJ-CCR and Symbios, working as part of the teams responsible for developing and maintaining the programmes.

Talk to me before you buy a rebreather.
A rebreather is a major investment, and choosing the wrong unit or configuration can create problems long after the purchase has been made.
If you're considering CCR training, talk to me before buying a unit. I can help you understand the options, work out what is appropriate for your goals and, where appropriate, help facilitate the purchase of a unit.
There isn't one CCR that is right for every diver. The best choice depends on the diving you want to do, your longer-term plans and how you intend to train.
I have also written about which GUE CCR to choose, including the factors worth considering before you buy.
Ask about equipment → Read the full GUE equipment guide →Mexico is an excellent environment for CCR training. Based in Puerto Aventuras, I can combine warm, clear water with access to deep sites both offshore and in some of the Riviera Maya's deeper cenotes.
Training with Zero Gravity provides the infrastructure and support needed to concentrate on the diving and the learning rather than the logistics.
Technical Fundamentals can lead in either direction.
Technical Diver 1 and Technical Diver 2 provide a progressive open-circuit route into deeper mixed-gas diving. CCR provides another option for divers who want more time at depth while reducing the helium demands and logistics associated with deeper open-circuit diving.
If you're not sure which route makes sense for your goals, get in touch. We can talk through what you want to dive and work backwards from there.
Explore Technical Diving →CCR Fundamentals is the gateway to GUE CCR training. If you're considering a rebreather, planning CCR Fundamentals, or already thinking about CCR Tech 1, get in touch.
Don't see a date that works? Published classes are only part of the picture. If you have a particular course or timeframe in mind, get in touch. Classes can often be arranged around your availability.
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