Advanced Trimix

The TDI Extended Range or Trimix Diver looking to:

Extend their depth range

Advance their technical diving education

Minimum age 18

Minimum certification of TDI Extended Range or Trimix Diver or equivalent

Show proof of 100 logged dives, 25 must be deeper than 30metres/100feet

Advanced decompression dive planning including:

Gas planning based on equivalent narcotic depths, nitrogen and helium absorption and elimination, CNS and OTU limits, isobaric counter diffusion, volume requirements, etc.

Use of hypoxic gasses

HPNS and isobaric counter diffusion

Decompression gas choices

Tables vs. personal dive computers

Emergency and contingency planning (equipment failure, omitted decompression, etc.)

Decompression diving procedures

Equipment selection

Pre-dive checks and drills

Stress analysis and mitigation

Following a decompression schedule

Gas switching

Team awareness and communication

SMB/lift bag deployment

Proper trim, buoyancy and fining techniques

Management of multiple (minimum of 3) decompression/stage cylinders

Emergency procedures (equipment failures, catastrophic gas loss, omitted decompression, navigational errors, injured/unconscious diver, etc)

Equipment considerations, cylinder labeling, analyzing trimix nitrox and mixes, and gas blending procedures

Ability to conduct technical diving activities using custom trimix mixtures without direct supervision, so long as the following limits are adhered to:

The diving activities approximate those of training

The areas of activities approximate those of training

Environmental conditions approximate those of training

Satisfactorily complete the TDI Advanced Trimix course written examination with a passing score of 80%, followed by 100% remediation by the instructor

Complete all open water requirements safely and efficiently

Demonstrate mature, sound judgment concerning dive planning and execution