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Helitrox Diluent Closed Circuit Rebreather / Decompression Procedures Diver

Unit Specific Megalodon / Pathfinder / Tibruon

This is the second entry level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for mixed gas diving using a Helitrox diluent. The objective of the course is to train divers in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills, to a maximum of 45 metres / 150 feet, using an air/nitrox/helium diluent for formal decompression diving. Student are permitted to utilize a diluent and bailout mix with no greater than a 20% helium content (+/- 5%) and no less than a 21% oxygen content and are permitted to use up to 100% oxygen for decompression.

Upon successful completion of this course, graduates may engage in decompression diving activities utilizing helitrox on CCR without direct supervision provided. After this course graduates can enroll in TDI Mixed Gas CCR course. 




Student Prerequisites

  • TDI Air Diluent CCR Diver certified: or equiv
  • 30-50 hours on your CCR unit
  • Must be able to hold stops / hovering at 30ft, 20ft, & 10ft


The following equipment is required:

  1. A complete closed circuit rebreather
  2. Minimum of 1 CCR dive computer, or bottom timer and depth gauge
  3. Mask, fins and a suitable line-cutting device
  4. Slate and pencil
  5. Reel with a minimum of 50 metres / 165 feet of line
  6. Lift bag / delayed surface marker buoy (DSMB) with a minimum of 12 kg / 25 lb lift
  7. Exposure suit appropriate for the open water environment where training will be conducted
  8. Access to an oxygen analyzer (instructor will have one)
  9. Appropriate weight
  10. Bailout gas supply cylinders typically an AL80 and AL40 with regulators, SPG, and lp hose.

Cost $750 Contact Becky    (2 student minimum)

  • Cost does not include your expenses such as O2, Sorb, Site entry fees, or lodging. 
  • Instructor expenses will be split between all students
  • Becky would be happy to travel to your area for training.  Please contact us to discuss options.