Posted by Steve on April 16, 2001 at 11:57:16:
In Reply to: Re: More discouraging news about helium. posted by MHK on April 16, 2001 at 11:20:33:
"As I have said often I use the following:
Nitrox from 0' - 100'
Hyperoxic or normoxic trimix from 100' - 200'
Trimix from 200' and deeper..
I never use a gas that will render a END of 100' or greater so it's pretty easy to balance the gas.."
I'll bet your recommendations aren't that far off from Karl's, he's airing to the side of caution when it comes to any gas besides air because air is more forgiving and anything other than that requires specialized training and skill.
"But with respect to Karl, heading a program that teaches deep air to 165' and then suggesting that He isn't the way to go is just plain stupid and wrong.."
My interpertation is that he wants the student to proof that they can be disciplined enough to make those critical stops and do them on air before he would trust them with the mix. A diver can be trained to handle narcosis levels down to this depth and beyond according to some. I can see some advantage to having this capability.
Steve