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TDI JJ-CCR Helitrox

5 days - £795
1 day - £250 (Already qualified CCR Air Dil divers)

Already an open circuit technical diver?This course is similar to the JJ-CCR decompression procedures course but because of your experience will allow you to dive using a diluent and bailout gas mix of no greater than 20% helium and no less than 21% oxygen. The qualification depth is still 45 metres but the diver will be trained to use air/nitrox & helium diluent for decompression diving, yet further extending bottom time and significantly cutting the effects of gas narcosis.

Alternatively, you might want this course as a one day bolt-on if you already hold the JJ-CCR Deco Procedures course.


Skills include:

Setup and maintenance of the unit

Loop volume management

Calibration of electronics

Emergency procedures

Buoyancy control

CNS tracking

Decompression planning



Minimum of 18 years of age

Be an open circuit qualified technical diver (TDI Advanced Nitrox & Deco Procedures/IANTD ART/PADI Tec 45 or equivalent)

Have a minimum of 50 logged open water dives


Hold an Air Diluent CCR Diver certification from any agency

Have a minimum of 30 hours on the CCR unit with 6 months CCR diving experience


Cost & Duration

5 days - £795

1 day for already JJ-CCR Air Dil Deco divers - £250



Certification Fee

Instructor’s gas, sofnolime & entry (if applicable)

Bailout & decompression cylinder & regulator hire

Knowledge Development

You'll have a TDI rebreather manual to work through and there'll be a number of theory sessions throughout the course to go over knowledge reviews and ensure sufficient knowledge is attained prior to the final exam.


The cost of your own gas and sofnolime is not included for the course duration. The training can either take place or culminate at NDAC, there is a fee of £17 per student per day payable directly to the centre. There is also a fee for any additional equipment required to be rented for the course.


What’s next

Once you have completed a minimum of 50 CCR dives totalling at least 50 hours (25 hours minimum on the JJ-CCR) you can progress to the TDI CCR Mixed Gas course (MOD2/Level 2). The course is designed to use trimix as a diluent and bailout gas to safely conduct decompression diving to a maximum depth of 60 metres.

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