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PAlexakos@ao*.co* wrote:
> 
> George,
> 
>     Many thanks for taking time to do this.  Am I safe in assuming that you
> no longer tolerate a 100ft END, but have moved it up to 80ft?  Also, is the
> 1.2 ppo2 a new standard for you?
 
 Panos, we have a "maximum end" of 100 in our standards, but try to get
it as low as we can no matter what the depth. For PPO2, we have a
"maximum" of 1.4, but that applies more to dives where there is little
bottom time or deco. As the dives get longer, we lower the ppo2 max. I
actually dive under 1.0 for severe diving times ( 10% oxygen at 10 ata
). 

 In all cases, the END and ppo2 are set with the maximum depth to be hit
on the dive in mind, not the average and not even really the profile
that we use to calculate deco. I watch the profile as we go, and take
that into consideration after the fact to get the deco tuned more
exactly.

 I can tell you this : spikes in PPO2 during a dive are dangerous and
have been implicated in tox, so you do not want to under mix there, and
Murphy's law says that the Charlie Foxtrots will happen at the deepest
point of the dive, and in fact every one we have had , like me losing
the line at an intesection where one tunenl had no line and having
Vinny's scooter simulatneously lock up with him and JJ off the line
tryhing to fix it happened at 299 in a profile that was looking more
like 260-270. We did the right thing - they froze in position, I got the
wall for a fix, JJ then swept and got the line ( it was in tannic above
us), I smacked Vinny's scooter with my stage bottle but it would not
unjam, so we backed up and smoked the tunnel with no line, rather than
continuing into the cave any further with one scooter ( out of 12 )
down. 
 

 

   Panos,

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