Gotta jump in here.  I have been following this thread with great interest
cause I know the people involved.  I have not heard anyone who was there say
he was breathing the air tank as a travel mix.  This is just another example
of people assuming and making statements to further the cause or just jump
in the band wagon.  Is using air as a travel mix stupid when you've got a
17% back mix?  Yes it is.  Was it used, I think not!

Art.


		-----Original Message-----
		From:	Mike Rodriguez [mailto:mikey@ma*.co*]
		Sent:	Monday, August 16, 1999 11:39 PM
		To:	Joel Silverstein
		Cc:	techdiver@aquanaut.com
		Subject:	Re: Petting the Air Pony: was Re: Doria
Deaths - Let's dive  some air

		At 07:50 PM 8/16/99 -0400, Joel Silverstein wrote:

		Hello Joel,

		>That's not it -- they just dont understand that its not
needed. They dont
		>understand partial pressures, they dont understand that you
dont need a
		>hypoxix mix for a 250 fsw dive,

		[SNIP]

		Am I missing something here?  A normoxic mix at 250 fsw has
a
		PO2 of 1.8 AtA.  At 19.2% O2, the PO2 is 1.6 AtA and at
16.9%
		it's 1.4 AtA.  To dive safely at 250 fsw, a hypoxic mix at
no
		more than 16.9% O2 should be used.

		Now, 16.9% O2 is perfectly breathable all the way from the
surface
		to the bottom, of course, and reaches a normoxic PO2 just a
few
		feet below the surface so a travel mix is not needed and
doesn't
		makes sense on this dive, but the mix *does* have to be
hypoxic
		to be safe.

		-Mike Rodriguez
		<mikey@ma*.co*>

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