TDI CCR Advanced Mixed Gas (100m)


The highest level of Closed Circuit Rebreather (CCR) training that TDI offers, the Advanced Mixed Gas Course will teach you how to use the full capabilities of a CCR. With a maximum depth of 100 metres, this course opens up a whole new realm of diving including new wrecks, caves and walls to explore in depths you previously could not reach on a rebreather. This intensive course conducted over seven dives will focus on all the elements needed to plan and execute dives to these depths.  An ideal opportunity for the certified TDI Mixed Gas CCR Diver (or equivalent) looking to extend their depth limitation.

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:
    • Central nervous system tracking
    • Additional fitted equipment and modifications
    • Limits based on system performance
    • Limits based on oxygen exposure
  • Classroom training – Your instructor will then review this and go into further detail covering topics such as those listed below, plus many others:
    • Drills for buddy rescue
    • Analysis and labelling of gases
    • Team orientated drills for lift bag deployment and gas switching
  • 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:
    • Gas shutdowns and loss of gas
    • Understanding and implementation of team bailout procedures
    • Managing multiple failures in adverse conditions
    • Recovery from system failure drills


    • Minimum age 18 years old 
  • The TDI CCR Mixed Gas Diluent Diver (or equivalent) is the pre-requisite for this course along with proof of 100 logged CCR hours over a minimum of 100 dives. (50% must be deeper than 30m and all must be deeper than 9m
  • 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


– €1450 pp (1 person)

– €1350 pp (2 people)


– Reading materials + certification

– Cylinders + Gases (exc Helium due to fluctuating cost)

– 420 minutes of CCR diving over a minimum of 7 dives including one configuration dive of a maximum 60 mins

– Transport to and from dive sites

– 20% off equipment rental

Time commitment 

5 days