The TDI Trimix Diver Course will teach you to dive deeper and best of all remember all of the dive.

As your motivation to explore progresses you will find that you may want to go deeper to dive that wreck that is 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 how to minimize the effects of narcosis by adding helium to offset the nitrogen in your breathing gas.

While taking the Trimix Diver course your TDI Instructor will teach you how to plan and execute dives utilizing as little as 18% oxygen and diving to maximum depth of 60m with a blend of helium appropriate for the planned depth.

This course is essential if you want to seriously dive some of the deep wrecks around Singapore such as the HMS Repulse or HMS Prince of Wales, and is beneficial for shallower wrecks as well, particularly for those divers who are a little more prone to narcosis.

Your TDI Instructor will also cover:

  • Dive team planning
  • Gas matching
  • Cylinder labelling
  • Surface marker deployment from depth
  • Equipment configuration
  • Best mix for each depth


  • At least 18 years of age
  • TDI Advanced Nitrox certification or equivalent
  • TDI Decompression Procedures certification or equivalent

Course schedule:

  • Independent study online
  • Four open water training dives