Mike, we are thinking it is more like 80 feet. Even at 40 ft on air, one is
not the same as at one ata. I will bet that 1 ata plus or minus a few points
is what we need and all we can handle, just like 02 at 21 plus a few points,
but not minus.

The really funny thing about this is that is has been figured out 4 billion
years ago, but some don't yet get it.

Merry Xmas to you , too , Mike.

-----Original Message-----
From: Michael J. Black [mailto:mjblackmd@ya*.co*]
Sent: Monday, December 24, 2001 10:08 AM
To: Aquanaut Mail
Subject: DIR and Nitrogen Narcosis


It's Christmas time, and in uncharacteristic fashion, Dr.
Black will say something good about the Doing It Rightists.
They are right about preaching that diving deep on air is
wrong.  Inert gases act as anesthetics, and nobody is immune
to this...no human body can be immune, it is not physiologically
possible.  Divers who claim to be "good on air" are good on
BS.  Regarding tolerance, although some subjective adaptation
is possible, there is no objective adaptation; not anymore than
one could adapt to the anesthetic gases an anesthesiologist
would give you prior to surgery.

Diving deeper than 130 feet on air is dangerous, and any
agency that recommends this prior to obtaining a higher level
of certification (i.e. trimix) is wrong.

Merry Christmas to the Doing It Rightists and everybody else.

Dr. Black, aka icediver


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