With the PADI tec trimix 65 course no more narcosis at depth.
Going beyond 50 meters on air is dangerous due to the effect of the nitrogen narcosis, so to go deeper you need to use a mix of gas contening a proportion of a different inert gas (helium) to replace the nitrogen and its effect. This blended mix is called trimix (3 mixtures composed of O2 - He - N2).
The tec 65 "normoxic" course is the first step to dive deeper and safer.
The "normoxic" annotation, historically, was because the gas is breathable at the surface (down to 16%), but nowadays (and depending the diving agency certification) the "normoxic" notation means "normal amount of oxygen" which is between 21% like on the surface down to 18% O2 max (breathable on the surface and giving a reasonable PPO2 of 1.4 at 67 meters).
During your tec65 course you will go to a maximum depth of 65 meters (210 feet).
Where to learn the PADI tec trimix course?
All trimix courses (open circuit as well as closed circuit) are given at our Scotty's dive center headquarters in Mactan, Cebu province.