Trimix Diver



As your motivation to explore progresses you will find that you may want to go deeper to dive that wreck that is an interesting part of history or that cave system that you have read so much about. One of the major limiting factors of going deeper is narcosis; TDI’s Trimix Diver course shows you how to minimise the effects of narcosis by adding helium to offset the nitrogen in your breathing gas.


What Will You Learn?

While taking the Trimix Diver course our TDI Instructor Greg will teach you how to plan and execute dives utilising as little as 18 percent oxygen and diving to a maximum depth of 60m with a blend of helium appropriate for the planned depth. The Trimix course covers the use of multiple stage cylinders to allow you to optimise your decompression, as well as covering decompression theory and diving physiology.

The course is conducted over four days with two dives in excess of 40m. We can arrange your course to run at the coast, an inland dive site or abroad somewhere warm such as Malta. Please get in contact to discuss the best option for you!



  • Minimum age 18 
  • Minimum certification as a TDI Advanced Nitrox Diver and TDI Decompression Procedures Diver, or equivalent 
  • Provide proof of a minimum 100 logged dives 


Ready To Book?

Simply choose from one of our available course dates below. A £100 deposit will secure your chosen course start date, and the balance can be paid any time before the end of your training. If you don’t see any suitable dates, please get in touch and we can try to accommodate your request.

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