Rebreather (CCR)

Liberty & O2ptima CM: Mod 1 to Trimix CCR Instructor

We train on two CCR platforms: the Divesoft Liberty and the Dive Rite O2ptima CM. Courses range from your first CCR dives (Mod 1) through advanced Trimix CCR and Instructor certification. Cross-certification available.

Platforms We Train On

Divesoft Liberty

A modular, electronically-controlled CCR renowned for reliability and flexibility. Available in multiple configurations for both recreational and technical diving.

Dive Rite O2ptima CM

A chest-mounted, electronically-controlled CCR from Dive Rite, renowned for its compact profile and reliability.

CCR Courses

CCR Mod 1

40m

Your first steps on closed-circuit rebreather. Learn unit assembly, pre-dive checks, bailout procedures, and fundamental CCR diving skills. Limited to 40m on air diluent.

CCR Mod 2

60m

Extend your CCR range to 60m using EANx diluent. Deeper bailout planning, more complex gas management, and advanced troubleshooting.

CCR Crossover

up to cert level

Already certified on another CCR platform? Cross over to the Divesoft Liberty or O2ptima CM with an efficient, tailored programme at your current certification depth.

Advanced Mixed Gas CCR

100m+

Combine CCR with trimix diluent for deep technical diving. Gas planning, extended decompression, and emergency management at depth.

Trimix CCR

150m

The pinnacle of CCR training: hypoxic trimix diluent for the deepest technical dives. For experienced CCR divers pushing extreme depth limits.

CCR Instructor

all levels

Train the next generation of CCR divers. Nadir holds CCR Instructor certification on the Divesoft Liberty and brings decades of real-world experience to every candidate.

Thinking about CCR?

Not sure where to start? Get in touch: we'll help you choose the right platform and course level for your experience and goals.

Get in touch