Allowing dives to a maximum of 100 metres/330 feet and utilizing custom helium, nitrogen and oxygen mixes, the TDI Advanced Trimix Instructor Course is the crowning achievement for technical instructors. During the course, the instructor candidate studies a well-rounded curriculum and completes four training dives to demonstrate mastery of advanced trimix skills.

Topics that candidates may be asked to present include:

• HPNS
• Use of travel gasses
• Hypoxia
• Equipment considerations
• Dive planning
• Omitted decompression
• Oxygen toxicity

Advanced Trimix Instructor Course Prerequisites

• Minimum age 21
• Certification as a TDI Advanced Trimix Diver or equivalent
• Certification as a TDI Extended Range Instructor or TDI Trimix Instructor or equivalent
• Provide proof of 250 logged dives, of which 30 must be Trimix dives
• Provide proof of 20 dives deeper than 55 metres / 180 feet

And meet one of the following experience requirements:

• Certify at least 10 extended range divers or Trimix divers to depths of at least 45 metres / 150 feet
• Assist with at least 2 complete TDI Advanced Trimix classes taught by an active TDI Advanced Trimix Instructor and provide a letter of recommendation from the assisted instructor(s)

Course Standards & Procedures