Why is DrMike so ready to abuse, condemn and put down.. that is, say that I am going to die, because I want to hear people's answers to questions that we should all know? And, why cant he answer the questions with the same expenditure of enthusiasm? Is it because he is better at condemning than explaining? Or maybe his understanding of human stupidity exceeds his understanding of dive theory. Well, my answer is that both divers are spending their complete bottom time breathing EXACTLY the same gas. And, therefore if one where to use tables to plan the dive (not just brainlessly rely on whatever the computer tells you), both divers would come up with EXACTLY the same dive profiles -- before they even entered the water.