TDI CCR Mixed Gas Instructor

TDI CCR Mixed Gas Instructor

This is the instructor level certification course for instructors wishing to teach the mixed gas closed circuit rebreather course. The objective of this course is to train instructors to teach mixed gas rebreather diving and to develop technical rebreather diving skills appropriate to diving to a maximum depth of 60 metres / 200 feet or the maximum depth set by the manufacturer of the specific unit, using trimix with 16 percent oxygen (O2) or greater. This course is manufacturer specific.

TDI Mixed Gas Instructor

Rebreather Mixed Gas Instructor Course prerequisites:

  • Minimum age 21
  • TDI CCR Air Diluent Decompression Procedures (unit specific) Instructor (or equivalent) with 15 students taught and 1 year teaching experience on the unit specific CCR


  • TDI Open Circuit Trimix Instructor 100 metres / 330 feet full rating or equivalent, with 15 students taught and 1 further year teaching experience of Trimix open circuit


  • Properly verified proof of 30 logged mixed gas dives on a rebreather with 15 logged dives beyond 65 metres / 215 feet

Upon successful completion of this course, graduates may teach the TDI Mixed Gas Closed Circuit Rebreather Course not to exceed the manufacturers designed depth maximum of 60 metres / 200 feet with mixed gas diluent.

Course Structure and Duration:

Open Water Execution

  • Four dives

Course Structure

  • TDI allows instructors trainers to structure courses according to the
    number of students participating and their skill level


  • The minimum number of classroom and briefing hours is 6

What you can expect to learn:

  • Electronic Systems Design and Maintenance
  • Gas Physiology
  • Demonstrate a complete systems check and rebreather configuration
  • Properly execute the break down and maintenance of rebreather