TDI – Advanced Trimix Diver: The TDI Advanced Trimix Course provides the training required to competently and safely utilize breathing gases containing helium for dives that require staged decompression, utilizing EANx and / or oxygen mixtures during decompression to a maximum depth of 330 fsw (100 msw). The objective of this course is to train divers in the benefits, hazards and proper procedures of utilizing custom oxygen / helium / nitrogen mixtures as breathing gas.

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