HOW DEEP WOULD YOU GO ON AIR while SOLO DIVING IN A CAVE?

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Originally Posted by floridakid

Lol, the only reason I said sludge was because he corrected me on it 2 days ago

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Just busting your balls. According to Taming of the Slough, Lower Lower OG is the correct term for the deep section. Lower OG is the cavern area (60ish to 100ish).

I have done 170 on air in a cave, but only in an area where I had direct access to go up to allow narcosis to clear, and it was planned for that. I would not venture down a tunnel at that depth. Probably 100 is the deepest I would go on air, but why is there a difference between what gas you breath with a buddy or solo? Either the gas is safe for a given depth or not. (By safe, I use the 1.4 work working and 1.6 for deco rule)

Well I tell my students that smoking makes better divers.
You kill half of your lungs, so you don't need to breathe that much any more ;)

I stopped smoking for tech diving too. But I was never a chain smoker anyway ;)

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Originally Posted by Skorpiov

Reference: Increased risk of narcosis results from increasing the amount of carbon dioxide retained through heavy exercise, shallow or skip breathing, or because of poor gas exchange in the lungs.[22]

I'm sure its related! ;-) it was also poor planning on my part. We do JSA's on nearly everything at work (well I dont, but the guys that actually work do) and I am so used to stepping through every step of a job looking for potential issues, that I should have seen this coming.

PS. I also used to smoke cigarettes at that time. Gave them up due to CO hits at depth (and I wanted to live longer). Did you know chain smoking before deep dives is a recipe for trouble? I didnt.

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Maybe that explains why my sac rate has gone up slightly since I quit. hmmm... Maybe I'll take it up again...

j/k

shallow? 300ft? :D

What PP is "normal" for toxing?

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Originally Posted by FW

Yes, toxing on air was a problem at one time. Mostly people trying to set air depth records. There are a few notable cases of it happening as shallow as 300', though.

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Originally Posted by Curt Bowen

Probably not more than 240, it would depend on the conditions in the cave.

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Same here I have hit 225'

160 feet

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Originally Posted by OH

shallow? 300ft? :D

What PP is "normal" for toxing?

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There is no "normal". There have been hits at 1.6, and Jim Miller survived over an hour at around 3, before his hit. 300' on air is just over 2.1.

I think it also more than just the total PPO2, I think time spent there is at least as relevant, so it's not just a how deep would you go, but it's also how long would you stay there. But with air, I think it's the N2 and not the O2 that is usually the biggest concern.

I wonder if the same mechanism that causes narcosis would increase the seizure threshold, thus delaying or preventing convulsions due to oxygen toxicity...