Who this course is for:

• The TDI Extended Range or Trimix Diver looking to:
  • Extend their depth range
  • Advance their technical diving education

Course prerequisites:

• 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

What you can expect to learn:

• 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

What’s in it for you?

• 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

TDI Advanced Trimix minimum requirements:

• 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