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Extended Range / Trimix

Extended Range/ Trimix

The perfect combination for advanced technical training is the TDI’s Extended Range/Trimix combo package.
Certain areas of the world provide spectacular dives at depths deeper than 39m/130 feet but you will not have access (or very limited access) to helium. The TDI Extended Range course teaches you the proper techniques for utilizing compressed air as a breathing gas and with a maximum depth of 55m/180 feet you won’t have to miss those dives. The Extended Range course will cover topics and skills such as

  • Equipment requirements and configuration
  • Decompression options
  • Use of surface marker buoys
  • Buddy rescue
  • Narcosis checks and management

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 percent oxygen and diving to maximum depth of 60 m/200 feet with a blend of helium appropriate for the planned depth. The course covers topics and skills like

  • Dive team planning
  • Gas matching
  • Cylinder labeling
  • Surface marker deployment
  • Equipment configuration
  • Thermal protection options

The Extended Range and Trimix Manual is the text-book literary assistant to the TDI Extended Range and Trimix certification course. Extended Range diving is exploring the limits of up to 180 FSW (55MSW) for air as a bottom mix and up to 200 FSW (60 MSW) for basic trimix. Within this range, the diver can explore many additional sites that are beyond the standard recreational Open Water limit of 130 FSW (40 MSW).With the Extended Range course behind them, a diver will be properly equipped to evaluate and plan dives where some of the less frequently visited wrecks lie, some potentially rare fish can be sighted, as well as interesting geological features.

Prerequisites and eLearning availability.

  • Minimum age 18
  • Certified as a TDI Advanced Nitrox Diver and TDI Decompression Procedures Diver, or equivalents
  • Provide proof of a minimum of 100 logged dives, of which 25 must be deeper than 30 metres / 100 feet
  • eLearning availability No!

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