Is it just as simple as depth related, say over 40m becomes technical? Or is it the kit that`s used/gas mix used? or a mixture of the above? As a DL and i have had the progression dives I can dive to 50m on air (do I want to as a norm? NO!) but I wouldn't class my self as a technical diver (in fact quite the opposite) I have Nitrox training so if I used a weak mix to say 45m would I then become a technical diver or would it be with the introduction of He (I am not trimix trained)? I have the use of a twin set if required so if I used that going to say 45m with a weak mix would that make it a technical dive? EDIT: or am I just rambling on because I am bored?