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150 Township 5 Camillus NY
315-378-7175

TDI Trimix Diver



Who this course is for:

  • The certified Advanced Nitrox and Decompression Procedures diver looking to:
    • Extend their depth range
    • Reduce narcosis for all deep dives
    • Advance their technical diving education

Course prerequisites:

  • Minimum age 18
  • Minimum certification of TDI Advanced Nitrox AND Decompression Procedures Diver, or equivalent
  • Proof of 100 logged dives

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 OUT limits, Isobaric Counter diffusion, volume requirements, etc.
    • 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 finning techniques
  • Management of multiple 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 provided:
    • The diving activities approximate those of training
    • The areas of activities approximate those of training
    • Environmental conditions approximate those of training
  • Ability to enroll in TDI Advanced Wreck and TDI Advanced Trimix courses

TDI Trimix Diver minimum certification requirements:

  • Satisfactorily complete the TDI Trimix Diver course written examination
  • Complete all open water requirements safely and efficiently
  • Demonstrate mature, sound judgment concerning dive planning and execution

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Included Materials


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This class cannot be purchased online. Please contact the store for more information.