With all that money being thrown around and not an oxygen analyzer among
the group...

I wonder what they'll forget this time.

Trout

----------
From: FBama98@ao*.co*
To: cavers@ca*.co*; techdiver@aquanaut.com;
freeattic@co*.ci*.uf*.ed*
Subject: Those who forget the past...#22
Date: Sunday, August 23, 1998 10:06 AM

"Another incident occurred…which was cause for greater concern.  During
their
descent into the 308 tunnel from 270 Rock on the way in, Parker said that
he
was working fairly hard, just trying to get the DPV to behave in some tight
turns, when suddenly he noticed the unmistakable sensation of facial
twitching
and numbness in his lips.  He immediately switched to his 5th (!)
independent
stage bottle of heliox and found that once he had done that the feeling
went
away as fast as it had come…Investigation following the incident showed
that
very small leaks existed in both sleds.  These were too tiny to permit an
air
leak, but sufficient to permit a small helium leak.  Since these sleds were
‘topped off' following each dive rather than recharged, it was concluded
that
the slow helium loss eventually led to increased oxygen concentration to
produce the symptoms described above.  The solution was to attend to the
valves, and to establish a procedure of completely emptying the bank prior
to
recharging."

Stone, W. C., The Wakulla Springs Project, pg. 127-128, The U.S. Deep
Caving
Team, Gaithersburg, MD, 1989
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