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TDI ADVANCED NITROX AND HELITROX Learn about Trimix right from the beginning!

TDI Advanced Nitrox & Helitrox with Tech Asia

Technical Diving is every bit as much about diving safely as it is about diving deep. The gas you choose plays a big part in this and by opting for the Helitrox course you'll be earning yourself a certification to use Trimix right from the beginning of your technical diving path. This combined course is almost the same as Advanced Nitrox & Deco Procedures, but with it's deeper dives made on Trimix instead of air. It's the most complete entry level course you will find! 

This training is an alternative to TDI Deco Procedures, you don't have to do both. It is prerequisite to TDI Trimix courses and above, and to various levels of CCR (rebreather) training.  TDI eLearning is available - please contact us for details.

 What Will TDI Advanced Nitrox & Helitrox allow you to do?

Diving to 45m/150ft might not sound like much more than you have already done. In reality though, the difference in what you will now be able to do is like night and day. Take a dive like Puerto Galera's Japanese Wreck, settled at 42m/140ft. on the seabed. Most recreational divers don't even know it exists (nor dive shops know where to find it) and those that do have visited for maybe five or six fleeting minutes.

Now with this training you'll be able to take your time, maybe spend a good twenty five minutes picking through this fascinating seventy year old wreck site. And it isn't just the bottom time. Trimix at this depth has had us noticing things about the wreck, and other dive sites, that we had been swimming past for years. The difference in the feel and quality of the dive is remarkable. This isn't just about the depth...it's about the safe time to explore at depth you are gaining. Interested...? Read on!


  • Must have proof of 50 logged dives, and be certified Advanced Open Water and Nitrox.
  • TDI Intro to Tech is not required but highly recommended.
  • Miniumum age is 18 years old. 

Program Content and Limits

  • Max. Depth 45m/150ft
  • Confined water sessions are spent working on buoyancy refinement, propulsion skills, body position/trim, and emergency skills such as gas shares.
  • Six dives in total, at least two using Trimix, between 30m100ft and 45m/140ft.
  • Dives may be made on air or nitrox with EAN50-100 used to teach the fundamentals of decompression stops.

What You Will Learn

With this course you are really taking your diving knowledge to a new level, not just with diving procedures and technique, but with fascinating insights into your physiology and how your body works underwater... In class, during drills and in water you will learn about :

  • Thorough review of basic Nitrox.
  • Advanced equipment configuration, buoyancy, swimming and streamlining technique.
  • Stress management, respiratory physiology and diver safety.
  • DCS and decompression theory.
  • Oxygen - benefits and drawbacks.
  • Dive planning and gas management.
  • Benefits of helium as a deep diving gas.
  • Routine skills required in technical diving, as well as handling in water emergencies, and injury management.

Note: As with other TDI programs, the diver must complete and pass the written examination, complete all open water requirements efficiently and safely, and demonstrate mature and sound judgement in dive planning and execution in order to be certified.

Equipment, Materials, What's included?

You will find details of what is included and not included across all TDI courses on the Overview page.

The TDI Advanced Nitrox & Helitrox course is normally taught in double tanks although Sidemount is also an option for those already certified. A single decompression tank is used. Either a printed manual, or eLearning, are available for this course.

Course Options

Either TDI Advanced Nitrox, or Helitrox, can be taken separately if for example time is restricted. Please ask us for more information.

This is an alternative entry into technical Diving to Advanced Nitrox & Deco Procedures. Choose one or the other - there is no need to do both. Time taken is the same - the only difference in the cost is the price of the helium used in training (est $150/Php7,500 ) .