To gain this qualification the worker must prove competency in all of the five elements of competency.
Assessment is a combination of recognition of prior learning through entry prerequisites, and information and skills taught and assessed during course.
The topics of the five units of competency are as follows:
Any worker that that does not have the listed prerequisites will require additional training prior to certification
The course includes a test compression between 50m and 70m (5 and 7 bar) using normoxic trimix. This can be completed in the medical lock or on the TBM however as most medical locks have a maximum operating pressure of 5 bar (g) this intervention is usually completed on the TBM. While the pressure of this intervention can be modified to meet local regulations it should be to at least the pressure expected on the project. The second intervention must be completed on the TBM using the TBM intervention equipment and must be completed using normoxic trimix. The pressure of the second intervention will be dictated by the tunneling conditions at the time.
Theory topics include legislation, risk assessment, TBM trimix breathing equipment details, cylinder marking and gas analysis, advantages and disadvantages of trimix, trimix physiology, decompression tables, and trimix tunnelling procedures. There will be a written examination to complete the assessment.
The course is supported with a textbook specifically written for hyperbaric tunneling.
This course meets the training requirements set out by ADAS and successful candidates will be issued with a Trimix (normoxic) endorsement on their ADAS Hyprerbaric Tunnel Workers certification.