The course objective is to extend the depth range available to technical divers trained and qualified to use air, enriched air and oxygen for technical decompression dives beyond 50 metres/165 feet in open water. As part of the PADI TecRec instructional umbrella, the Tec Trimix Diver course reflects the training philosophies exhibited by the prerequisite Tec40, Tec45 and Tec50 courses. The approach is an instructional progression that directly addresses the added hazards, greater demands and challenges present in technical diving, most of which become more pronounced in the depth ranges typically associated with trimix use.