TDI Mixed Gas CCR


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/200 feet.

Who this course is for:

  • The certified TDI Air Diluent Decompression or Helitrox Diluent Decompression Diver (or equivalent) looking to extend their depth limitations.

Course Duration:

Courses should not be treated as a race or something that can be skipped through quickly. Please remember training does not guarantee certification, we need to ensure you fully understand the training and will be a safe diver on certification. We follow a loved one clause that when certified we would be happy you could safely dive with one of our loved ones.

We will strive to meet your timelines and requirements where possible and will always be dependant on student availability to attend sessions.


Course prerequisites & forms:

  • Minimum age 18
  • Provide a verified log of a minimum of 50 rebreather hours distributed over a minimum of 50 dives on the specific rebreather. If the diver has 50 hours on another CCR unit recognized by TDI, only 25 hours are required to be on the specific unit
  • Have completed and qualified the TDI Air Diluent Decompression Procedures Rebreather/TDI CCR Helitrox Diluent Decompression Procedures Diver course or equivalent from agencies recognized by TDI 

Medical Form
Liability Release 

What you can expect to learn:

The TDI Diving Rebreathers Student Manual is required for use as a review/recap document. The instructor may use any additional text or materials they feel will represent the topic in an educational manner. The following topics must be covered during the course:
    • Gas physiology
      • Oxygen (O2) toxicity
      • Hypoxia
      • Nitrogen absorption
      • Helium absorption
      • HPNS
      • Carbon dioxide (CO2) toxicity
      • Gas consumption
      • Gas mixing
    • Formula Work
      • Oxygen (O2) metabolizing calculations
      • Manually controlled closed circuit rebreathers
      • Equivalent narcosis depth theory
      • Central nervous system (CNS) tracking
      • Oxygen tracking units (OTU)
      • Gas management
    • Dive tables
      • Creation of custom dive tables appropriate to dive depths
      • Creation of lower percentage of oxygen (PO2) diluent to support loop flushing and bailout at depth
    • Dive computers
      • Mix adjustable
      • Constant partial pressure of oxygen (PPO2)
      • Oxygen (O2) integrated
    • Dive planning
      • Operational planning
    • Equipment maintenance
      • Fuel cell management
      • Loop configurations
      • Additional fitted equipment and modifications

    What’s in it for you?

    Upon successful completion of this course, graduates may engage in technical diving activities utilizing the unit specific CCR to a maximum of 60 metres / 200 feet, utilizing a mixed gas diluent containing 16 percent or greater oxygen provided:
      • The diving activities approximate those of training
      • The areas of activities approximate those of training
      • Environmental conditions approximate those of training
      • Ability to enroll in TDI Advanced Mixed Gas CCR Diver course

      How to take this course?

      • Get in touch with us by phone, whatsapp, facebook or e-mail

      Price & Value:

      TDI Mixed Gas CCR - Please Enquire

      *Fully inclusive of all e-learning, training and certification on successful completion. Gas costs are separate along with all instructor gas costs are covered by students.

      We focus on and are proud of the skill level, knowledge, decision making, experience and readiness of divers to dive at levels which they have been trained. We want to invest in you, your safety and ability to dive, then come home with amazing stories.

      Our courses are priced as such and we do not hide additional costs. We are are very flexible for training, especially in terms of dates or location as we know we all have busy lives and work commitments. However if for reasons outside of weather, illness or other such emergencies a course/training can not be completed in the standard training schedule we will charge for extra days at €150,00 per day.