Full Trimix OC

The Full Trimix course is the highest level of training in TEC diving and is required for all dives deeper than 75 meters.

Training content

In this course, you will no longer work on basic exercises, but must master all exercises to perfection and within the time limit. The aim is to prepare you for expedition diving and to train you in the techniques required for this, creating an awareness that this type of diving requires a lot of training. Descending to great depths is relatively easy. However, it can be enormously challenging for you or the team to come out of the water safe and sound with one or more problems. For all calculations and calculations in the trimix area, it is necessary to work with travel gases, base mixtures and several deco gases.

After completing the course, you must be able to plan and dive complex trimix dives with several gas changes in compliance with the gas laws.

Training objectives

  • Advanced Trimix training, Descend with rice gas
  • Problem solving – floating and ascending
  • Solving multiple errors with tight deadlines
  • Handling of 4 stage cylinders with trimix, nitrox and oxygen gas exchange, incl. deco gas redundancy
  • Explorer deco training with oxygen, nitrox and trimix mixtures
  • Making training measurable
  • Advanced Deko TEC training
Limit after successful course completion
  • Maximum depth 100 meters


At the start of the course:

  • Minimum age 21 years
  • Proof of health status, not older than 2 years
  • Proof i.a.c. Normoxic Trimix OC or comparable, according to current i.a.c. equivalence list
  • Logbook proof of at least 200 logged dives, including 70 deco dives and 50 deeper than 40 meters

Here you become a TEC Full Trimix OC