PSAI Fundamentals Mixed Gas Closed Circuit Rebreather Diver is where trimix diluent meets closed circuit diving. You plan staged decompression dives on a CCR with helium-based diluent, manage bailout cylinders seriously, and qualify to approximately 60 metres on training dives that must reach within three metres of the target depth.
Most centres schedule five to six days with six open water training dives of around 60 minutes each, plus workshops on loop care, scrubber discipline and mixed gas management. Oxygen percentage in trimix diluent stays no lower than 16 percent, plus or minus one percent, per PSAI standards. This is not a first rebreather course. You arrive with advanced rebreather foundation on your unit and substantial technical experience confirmed by the centre.
Expedition mixed gas CCR at 75 metres comes after this phase in the PSAI pathway. Students who rush Fundamentals without honest bailout planning usually get extra dives until the instructor is satisfied. That is normal, not a personal insult.
PSAI Fundamentals Mixed Gas CCR Diver is assessed through theory and demanding in-water performance on your qualified unit. Your instructor signs off when mixed gas, decompression and bailout skills meet PSAI standards at depth.
Quick answers about this qualification. For anything else, use live chat or browse bookable activities below.
Find activitiesIt is PSAI's mixed gas closed circuit rebreather certification to 60 metres with trimix diluent and staged decompression. The course includes six training dives of around 60 minutes each over typically five to six days.
It is the first trimix diluent CCR phase in the PSAI pathway before expedition depth at 75 metres.
PSAI Advanced Rebreather Diver or equivalent CCR foundation on your unit, plus substantial technical and rebreather experience confirmed by the centre. This is not entry-level CCR training.
Leave a comment when you book with your unit, certification cards and logged deco dives so the centre verifies eligibility before you commit.
Qualifying training dives reach 60 metres, within three metres of target depth on certification dives per PSAI standards. That is 200 feet in imperial units.
Expedition mixed gas CCR to approximately 75 metres is a separate phase after Fundamentals and logged experience at 60 metres.
Helium is added to the diluent gas in the loop to reduce narcosis and work of breathing at depth. PSAI requires oxygen in trimix diluent stay no lower than 16 percent, plus or minus one percent.
Mixed gas loop management is more complex than air or nitrox diluent. The course exists because open circuit trimix habits do not transfer automatically to CCR.
Typically five to six days with six open water training dives of about 60 minutes each, plus workshops and theory. Centres may spread training across multiple weeks if weather or gas logistics intervene.
Deep CCR courses rarely finish early. Build slack into accommodation and travel.
PSAI specifies six open water CCR training dives for this programme, each around 60 minutes. Planned stage decompression is included in course dives.
Additional dives are common if skills or bailout execution need more work. That is normal at 60 metres on a loop.
PSAI Expedition Mixed Gas CCR Diver at approximately 75 metres after you hold Fundamentals certification and meet logged mixed gas CCR experience at 60 metres per centre confirmation.
Skipping straight to expedition training without the Fundamentals phase and logged depth time is not the PSAI pathway.
Expect substantial theory assessment at this level. Centres use written exams, knowledge reviews and dive planning exercises to confirm mixed gas and decompression understanding.
In-water assessment on six training dives is equally important. You need both the paperwork and the loop discipline.
Your centre publishes bailout cylinder count, gas types and mounting for 60 metre mixed gas CCR dives. Undersized or poorly rigged bailout fails planning before you splash.
Ask for the kit list and gas plan template when you enquire. Budget for multiple cylinders and trimix fills.
Training is on manufacturer-approved units your centre teaches. Your Fundamentals card is unit-specific like all rebreather qualifications.
Confirm the centre supports your exact model and has instructor coverage before you book helium fills and a week off work.
adventuro lists PSAI centres with mixed gas CCR infrastructure: helium, oxygen, sorb supply and depth access for 60 metre training. Compare bailout requirements and whether workshops are included.
Train where you can continue logging mixed gas CCR dives after certification. One course week does not make you an expedition diver.
