Divers don't do nangs!!!!
Enriched Air Nitrox is commonly used by recreational and professional divers alike, to assist them in going on deeper and longer dives.
Basically, there is more oxygen in it than nitrogen, meaning less nitrogen bubbles absorb into your bloodstream than with just a normal dive tank. which means there is less chance of getting decsompression sickness/the bends after a long and deep dive, because there is less nitrogen in your system than normal.
you also need an Enriched Air Nitrox specialty certification card before you can even think about asking a dive shop to fill a tank with nitrox.
also, you could suck a nitrox tank clean and the only thing you would feel would be that you are an idiot for wasting it(it's expensive shit!).
hope that clears things up!
although, there is something that i find very interesting about nitrogen and diving.
it is a condition called Nitrogen Narcosis, and scientists are yet to discover exactly why it happens.
the symptoms usually start to kick in at about 30m and get worse as you go deeper. it makes you feel very intoxicated(like being drunk underwater) and makes you feel invinsible.
i have actually seen someone take their regulator(the thing you breath through) out of their mouth and try to give it to a fish he thought needed air!
scientists thnink it might have something to do with nitrogen bubbles blocking off nerve endings, making you feel dizzy and drunk. the symptoms dissapear as you ascend to the surface.
it's quite fun, if you know how to handle yourself at 30m+!!!