MIXED FORMS
THE EQUIPMENT
Nitrox diving is done in an open circuit. Nitrox is carried on board as a bottom gas with an oxygen content between 30 and 36% to extend the no-decompression limit. As a decompression gas with an oxygen content between 50 and 100%, it is generally used to optimize the decompression phase only.
Trimix diving can be done in both open and closed circuits. However, it requires proficiency with a rebreather or twin-cylinder system, obtained through Extended Range training.
WHAT ARE MIXTURES?
Nitrox is a mixture of two gases: oxygen and nitrogen. It's air that has been super-oxygenated by 22 to 100%. This essentially improves the quality of decompression by optimizing saturation and desaturation.
Trimix is a mixture of three gases: oxygen, nitrogen, and helium. The principle of trimix is to remove some of the nitrogen and replace it with helium. The aim of this maneuver is to counteract the narcotic effect of nitrogen and access new exploration zones (beyond 60 meters).
Here are some ideas for mixtures used:
Long dives to 30-40m with complete ease: Nitrox 32
Diving to 50m on a wreck without worrying too much about decompression stops: Air + Nitrox 80
Enjoy the beautiful drop-offs at all depths: Nitrox 26 + Nitrox 50
Diving to 70m in open circuit: Trimix 18/40 + Nitrox 50
120m rebreather dive: Trimix 6/70 diluent, Trimix 12/65 bailout, Trimix 25/35, Nitrox 50 and Nitrox 100