Hopefully this inquiry does not hijack the thread but here it goes anyhow and it is in regard to the padi as well as other tech course's.
I have a few people I know that are doing padi tech and saw one of their profiles of 150' on just 21% air. Reading other course structure like TDI and such you are using other mix's at that depth, and GUE well that is another story due to their standard gas starts at 32% (for all intents and purposes.
What I was wondering was if someone knows the reasoning for deep air dive's in the padI curriculum. I realize the steps of the program are small and that is fine just seems that one would want to try to not put themselves in a narc'd situation on purpose regularly?
Thanks