Advanced Level Trimix

Course Duration:

This course is run over five days and consists of one day of theory and four days boat diving. However, students who have already completed the Extended Range course may be credited two dives towards this course at the discretion of the instructor.


  • Minimum age of 18
  • Minimum certification as an Extended Range Diver or Trimix Diver (or equivalent)
  • Minimum of 100 logged dives


The objective of this course is to train divers in the benefits, hazards and proper procedures of utilising custom oxygen / helium / nitrogen mixtures as breathing gases with less than 18% Oxygen, and utilize Nitrox mixtures and Oxygen for decompression to a maximum depth of 100 msw.

This course is for students looking at diving deeper reducing the effect of nitrogen narcosis and handling Oxygen Toxicity.

This course is the highest diver rating achievable via the TDI course routes, it is extreme diving so therefore requires extreme levels of tuition. Students will master advanced planning techniques and open water skills required for this type of diving