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TDI Mod2 Mixed Gas CCR

TDI Mod2 Mixed Gas CCR Rebreatherpro-Training

TDI MOD2 Mixed Gas Rebreather Course

The TDI CCR Mixed Gas course is your next step into closed circuit rebreather diving, with the addition of helium as a diluent gas. The objective of the course is to train divers in the benefits, hazards and proper procedures for CCR mixed gas diving, and to develop skills suitable for CCR technical diving to a maximum of 60m.

What you learn

Using the latest in technology CCR’s maximize your gas supply and provide the optimum breathing gas for any depth by maintaining a constant partial pressure of oxygen (PPO2). During the dives (minimum of six) you'll learn all the necessary skills to conduct CCR dives using helium as a diluent gas and oxygen levels as low as 16% to a maximum depth of 60m.

Skills include

- Calculating off-board gas requirements
- Recovering from system failure
- Calibration of electronics
- Emergency procedures
- Removing and replacing off-board gases
- Surface marker buoy deployment

Qualification gained

Upon successful completion, you will be able to perform dives using the specific rebreather you were taught on, to a maximum depth of 60m, using a mixed gas diluent containing a minimum of 16% Oxygen.


To enrol on this course, you must:
- Be a minimum age of 18 years
- Hold a TDI CCR Air Diluent Decompression Procedures Diver certification or equivalent
- Provide a verified log of a minimum of 50 rebreather hours distributed over a minimum of 50 dives on the specific rebreather; 50 percent deeper than 20 metres / 66 feet. All must be deeper than 9 metres / 20 feet.
- If the diver has 50 hours on another CCR unit recognized by TDI, only 25 hours are required to be on the specific unit

Course structure

5-days with 6 dives. 1 dive will be for skill refresher and equipment configuration while the remaining 5 will all be carried out using mixed gas and deeper than 40m. 360 minutes of underwater time required for certification.


You will need your own full set of diving kit.


TDI CCR manual.

Would you like to see more? Go to the page Rebreather Courses.