TDI Trimix & Advanced Trimix Courses

What will You learn?

Trimix courses build on your foundation skills and experiences as your previous technical courses, but with the additional of learning how to dive with more than 1 deco cylinder on dives requiring more substantial decompression time.

Our course gradually steps you deeper and deeper as deco stops get deeper and longer and your dive sites get bigger and deeper.

Decompressing on a jon line after a long trimix scooter dive on the Andrea Doria

You’ll learn how to manage Normoxic trimix 16-18% oxygen depending on agency (NAUI vs. TDI) to a maximum training depth of 200′.

Advanced Trimix certifies divers in the use of Hypoxic trimix with the use of a travel gas and 2-3 decompression cylinders to a  maximum depth of 330′.

Rescue Diver
Technical Decompression Diver
100+ logged dives


This course is available privately for individuals or groups available locally or wherever you are located.

Course is often conducted in 5 days intensively or over 2 long weekends.

Training Agency

Additional Details:
Our TDI Trimix Courses are far more comprehensive than anyone else’s in the country. We are offering the most stringent skill requirements, the most academic knowledge and the highest standards in TDI. If you want the best TDI technical diving education you’ll want to take it with us and learn tech diving the proper way.

Our Trimix Diver Course is for technical divers wishing to dive to a deeper depth taking advantage of the benefits of a true Trimix dilluting the partial pressure of Nitrogen (reducing Narcosis) and in deeper diving dilluting the PPO2 to avoid CNS O2 Toxicity.

This course covers topics such as Helium, Oxygen, Nitrogen for breathing gasses. Argon, CO2, Carbon Monoxide, advanced physiogy, physics and chemistry of diving (kinetic energy, specific heat capacity, tissue solubility and more), dive planning, table model comparisons, Isobaric Counterdiffusion and variations of trimixes are just a few of the many topics to be discussed. To enroll in either Trimix course, you must be certified as a diver with Advanced Nitrox, Decompression Techniques, Helitrox, Heliair (for NAUI).

The Trimix Diver Course consists of two levels. These courses will give you the skills and knowledge needed to minimize the risks of utilizing helium-based Trimix breathing gas mixes for dives to a maximum depth of 250′ requiring staged decompression and utilizing EANx mixtures and/or oxygen during decompression. This Team driven program offers some of the most challenging skills found in technical diving and test the diver more than any previous course to date in the students technical diving path. Upon Successful Completion of the course you will be able to plan and execute technical dives that require staged decompression and utilize helium-based tri-mix breathing gas mixtures and EANx and/or oxygen for staged decompression to depths above 200′.

When the Diver gets to the Trimix level they are the most experienced technical divers. Extensive experience in double tanks is needed prior to enrolling in this course.We expect a minimum of 100 dives, 25 of which should have required mandatory decompression. Trimix Divers wishing to upgrade their skill sets, depth rating, knowledge and procedures will move into our Trimix Level II course.

Our Trimix Level II Course will teach you how to safely extend your diving depths down to 250′ for training purposes and 300′ or deeper after certified. The Trimix Level II Course will teach you more advanced methods and procedures. Students will work with up to 4 stage bottles, optimizing your mixes in deeper dives extending your bottom time, offgassing more effectively, the course also disects expedition trimix diving and what expedition diving is all about. Extensive experience in double tanks is needed prior to enrolling in this course.

For Trimix Level II we would like a minimum of 125 dives. 50 dives should be decompression or mixed gas dives.This is one of the most serious diving courses, as such, candidates should think long and hard about whether or not they should be participating in this program. This basically means, Practice, Practice, Practice before you enroll in this course or you will be re-taking your Advanced Nitrox/Decompression Procedures course over again. This really happens which is why we’re making this point.

Divers crossing into one of our Trimix Courses will be required to do a skills equivilency of all NAUI Intro to Tech Skills in open water prior to acceptance in our courses due to the large number of students we’ve had to retrain, sorry for any inconvenience.

Cost: $899 +GST for Trimix Diver Level 1 or $1495+GST as a combination course (Trimix 1&2).

Advanced Trimix Course $999+HST

Cost includes Certification Fees, Trimix Student Cert card.

Not Included: Gas Mixes, Charter Fees, Accomodations, Transportation, Park Admission Fees are Extra.

If you’re interested in this program a CD is available with a wealth of information.

What Gear Will You Need?
Full technical diver kit, including drysuit inflation system, 2-3 decompression cylinders properly rigged and marked with MOD’s.

Where Do I Go From Here?

Here are some popular examples of courses commonly taken by graduates of this course:

  • Technical Wreck Penetration
  • Cave1
  • Technical Sidemount
  • Cave 2
  • Advanced Trimix
  • Extreme Exposure Trimix
  • Technical Support Leader