Advanced Mixed Gas Closed Circuit
Rebreather Diver

This is the highest level certification course for divers wishing to utilize the unit specific closed circuit rebreather (CCR) for advanced mixed gas diving. The objective of the course is to train divers in the benefits, hazards and proper procedures for advanced mixed gas diving on a CCR and to develop advanced CCR diving skills appropriate to technical diving to a maximum depth of 100 metres / 330 feet (or shallower if mandated by local law).

Student Prerequisites

1. Minimum age of 18
2. Certified TDI CCR Mixed Gas Diluent diver, or equivalent from agencies recognized by TDI
3. Have a verified log of a minimum of 100 hours as a certified CCR diver over a minimum of 100 dives; a minimum of 50 hours and 50 dives must be on the unit specific CCR. Fifty percent of these dives must be deeper than 30 metres / 100 feet and a minimum of 20 logged CCR dives requiring staged decompression. All dives to be deeper than 9 metres / 20 feet

Course Structure and Duration

Open Water Execution:
1. Minimum of 420 minutes open water training to be completed over a minimum of 7 dives including 1 equipment configuration and drills practice air diluent dive to a maximum 40 metres/ 130 feet
2. All subsequent dives to build incrementally in no greater than 10 metres / 33 feet steps
3. A minimum of 6 dives must be conducted on mixed gas diluent
4. All mixed gas dives are to be deeper than 40 metres / 130 feet, and two dives should be deeper than 70 metres/230 feet.
5. Five of the mixed gas dives must be decompression dives. Planned decompression obligation for the first three decompression dives must not exceed 30 minutes and for subsequent decompression dives must not exceed 60 minutes. At least one dive must have a total run time longer than 60 minutes.

Required Equipment

The following are required for this course:
1. TDI Diving Rebreathers Student Manual or eLearning
2. TDI Advanced Trimix student manual or eLearning
3. Unit specific rebreather manual
4. TDI Diving Rebreathers PowerPoint Presentation
5. Manufacturer’s manual and updates
6. Manufacturer’s Build Checklist
7. TDI CCR Preflight Checklist

The following equipment is required for each student:
1. A complete unit specific CCR; this should be the student’s personal unit. Any modifications must be approved by the manufacturer.
2. Minimum of 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 3) 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 or spool with a minimum of 100 metres / 330 feet of line
7. Reel with a minimum of 50 metres / 165 feet of line
8. Two lift bags / delayed surface marker buoys (DSMB’s) with adequate lift and size for the dive environment
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: $2000 Not included is gear hire, gas fills, diluent, food, lodging, dive site fees & transportation.