The TDI Helitrox CCR course examines the theory, methods, and procedures for planning staged decompression CCR dives utilizing helium in the diluent to reduce narcosis.
The objective of the course is to train divers in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills, to a maximum of 45 metres / 150 feet, using an air/nitrox/helium diluent for formal decompression diving.
Student are permitted to utilize a diluent and bailout mix with no greater than a 20% helium content and no less than a 21% oxygen content and are permitted to use up to 100% oxygen for decompression.