TDI Advanced Trimix Diver

The TDI Advanced Trimix Diver course is the top level of training for open circuit divers wishing to dive to depths as deep as 100 metres/330 feet utilizing hypoxic levels of oxygen (below 17 percent). This course is perhaps one of the most informative and challenging of all of the TDI open circuit courses. Upon completion, you will be among some of the most elite divers, capable of doing and seeing more while diving than any other divers out there.

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
How to take this course!

  • Find an Instructor for this Course: here
  • Find your local Dive Center: here
Advanced Trimix Articles

  6 Skills Every Tech Diver Should Master
  Survivor or Statistic.. Which are You?
  5 Things Your Instructor Would Love for You to do Before Class
  3 Questions You Should Never Ask
  Why Divers Do Stupid Things
  Choosing the Best Decompression Gas
  How to Switch Your Diving Gas