Mixed Gas Closed Circuit - Rebreather Diver

This is the intermediate level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for mixed gas diving. The objective of the course is to train divers in the benefits, hazards and proper procedures for mixed gas diving on the unit specific CCR, utilizing a mixed gas diluent containing 16 percent or greater oxygen, and to develop intermediate CCR diving skills appropriate to technical diving to a maximum depth of 60 metres / 200 feet.

Student Prerequisites

1. Minimum age 18
2. Provide a verified log of a minimum of 50 rebreather hours distributed over a minimum of 50 dives on the specific rebreather. Valid logged dives must be deeper than 9 metres / 20 feet, at least 20 must be deeper than 30 metres / 100 feet, and at least 10 dives requiring staged decompression. If the diver has 50 hours on another CCR unit recognized by TDI, only 25 hours/25 dives are required to be on the specific unit. If completing a unit crossover, provide proof of at least 10 logged CCR dives in the last 12 months.
3. Certified as a TDI Air Diluent Decompression Procedures Rebreather/TDI CCR Helitrox Diluent Decompression Procedures Diver course or equivalent from agencies recognized by TDI

Course Structure and Duration

Open Water Execution
1. Open water drills practice air diluent dive and 50m fully-equipped CCR diver surface tow must be completed prior to conducting mixed gas diluent training dives
2. Minimum of 360 minutes open water training to be completed over a minimum of 6 dives including 1 equipment configuration and drills practice air diluent dive to a maximum 40 metres / 130 feet and a minimum 60 minute duration.
3. All subsequent dives to build incrementally in no greater than 10 metres / 33 feet steps

Required Equipment

The following are required for this course:
1. TDI Diving Rebreathers Student Manual or eLearning
2. TDI Extended Range and Trimix Student Manual or eLearning
3. TDI CCR Preflight Checklist
4. TDI Diving Rebreathers PowerPoint Presentation
5. Unit specific rebreather manual
6. Unit specific rebreather examination if required by the manufacturer
7. Manufacturer’s Build Checklist
8. Manufacturer’s manual and updates

The following equipment is required for each student:
1. A complete closed circuit rebreather configured within the manufacturers recommendations; this should be the student’s personal unit
2. One (1) CCR mixed gas computer and 1 backup OC/CCR computer for bailout in the event of a system failure
3. Bailout gas cylinders (minimum 2) with the appropriate capacity for the planned dive, each equipped with a first and second stage and SPG.
4. Mask, backup mask, fins and a suitable line-cutting device
5. Slate and pencil
6. Reel with a minimum of 60 metres / 200 feet of line
7. Reel with a minimum of 30 metres / 100 feet of line
8. Two lift bags / delayed surface marker buoys (DSMB’s) with adequate lift and size for the dive environment. Required for open water environments only.
9. Exposure suit adequate for the open water environment where training will be conducted
10. Access to an oxygen analyzer
11. Access to a helium analyzer
12. Adequate weight

Price: $1500 Not included is gear hire, gas fills, diluent, food, lodging, dive site fees & transportation.