TDI Entry Level (Normoxic) Trimix      This five days course provides the training required to competently and safely utilize breathing gasses containing helium for dives that require staged decompression, utilizing nitrox and/or oxygen mixtures during decompression to a maximum depth of 60m. Pre-requisites: Advanced Nitrox Diver and Decompression Procedures Diver or equivalent, 100 logged dives, of which 25 must be deeper than 30 msw. Minimum 18 years of age.