TDI CCR Mixed Gas (60m)


As a TDI CCR Air Diluent Decompression or Helitrox Diluent Decompression Diver, the TDI Mixed Gas CCR Diver course is your next step into closed circuit rebreather diving, it is your opportunity to explore a little deeper. 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 your TDI Instructor will teach you all the necessary skills to conduct CCR dives utilizing helium as a diluent gas and oxygen levels as low as 16 percent to a maximum depth of 60 metres.

The Training

  • Knowledge Development – Once you have signed up for the course, we will provide you with a digital CD manual to read and complete the relevant knowledge reviews before your practical training. You also need to have a copy of the manufacturer’s manual for the specific unit. You will cover areas such as the below, plus many others:
    • Fuel cell management
    • Operational planning
    • Equivalent narcosis depth theory
    • Gas mixing
  • Classroom Training – You will then review key areas and practise key dry skills with your instructor including the following:
    • Creation of custom dive tables
    • Loop configurations
    • Calculate off-board gas to cover stress situations
    • Correct narcotic depth planning
  • Practical Training – After you have reviewed the key knowledge areas and ready to go you will then join your instructor for the practical element of your training and cover the following areas:
      • Oxygen rebreather mode in depths less than 6 metres
      • Cell error drills
      • Managing multiple bailout cylinders
      • Flooded loop drills


  • Minimum age 18 years old 
  • The student must have 50 logged hours on the unit over a minimum of 50 dives and hold a TDI CCR Air Diluent Decompression Procedures/TDI CCR Helitrox Diluent Decompression Procedures qualification or equivalent.
  • You will need to fill out a self-certification medical statement. If you have any medical conditions you think may prevent you from scuba diving please contact us and we will try to be of assistance.


– €1300 pp (1 person)

– €1200 pp (2 people)


– Reading materials + certification

– Cylinders + gases (exc helium due to fluctuating cost)

– 3x Sofnolime fills

– 360 minutes of CCR diving over a minimum of 6 dives including one configuration dive of a maximum 60 mins

– Transport to and from dive sites

– 20% off equipment rental

Time commitment 

5 days