And they rely on a DM having enough gas at hand in case of an emergency.It is astounding that anybody survives diving in Cozumel. 100+ feet on an AL80. And they do it over and over again, pushing NDL's if they are on tire gas, with total dive times in excess of an hour. Some of the calculations I hear about for required gas for rec diving are almost amusing when you think about the reality of tourist diving in Mexico.
Of course you can and will get away with hopingall will go well. Dive equipment does fail, it is just a matter of time. I prefer filling half full tanks to the adrenaline rush of performing a CESA :blinking: