But a theoretical chance of hypercapnia beats a 100% chance of drowning.
The chance of hypercapnia is not theoretical. It's a physiological certainty, if you do it long enough. Problem is, how long is a piece of string?
So, what you're saying is, that re-breathing the air, as opposed to keeping it in your lungs, uses the same O2?
No, if you go back and read the passage again, you'll find I say that you'll be breathing progressively smaller fractions of oxygen. Your metabolism accounts for the missing moles. Is this really such a difficult concept?
Plus, you just may have some gas in the BC, enriching your mixture.
This I grant, if you're diving enriched air and feeding the BCD off the same source. Won't do anything for the elevated ppCO2's which you are poo-pooing, though.
Plus, you keep O2 content you would otherwise vent.
Again, minus the O2 you're metabolizing and again, you seem to think the air you rebreathe is pristine. It's not.
Yet it's easily vented if necessary, for ascent control.
Ah, a first change of tack! However, it is not easily vented, this procedure in fact needs tons of practice.
Well, we were on the couch,
Are we? I thought the whole thread was about getting up from 75 feet.
Makes no sense during a single tank OOA.
Then why are you even participating in this thread? It makes a lot of sense to me. If one has to use this method at all, which most newbie divers shouldn't.
First, control of buoyancy is an ESA issue. You'll need to make adjustments whatever the case.
Not really. Once you're on an ESA in a real emergency you will be trying to reach the surface ASAP going "aaaaa" ...
Secondly, why waist air when we have a small and finite supply?
Gosh, this is difficult, isn't it? The air emanating from your lungs is not pristine! If you don't want to waste it, get a closed-circuit rebreather with a proper scrubber!
Third, we're only doing this because our trip up has been delayed.
You really will have to specify why it is delayed.
One of you makes the point that it will reduce buoyancy, one says it increases buoyancy.
It's not the same thing, y'know, using your bag as a rebreather or venting the gas into the water. This is OW theory, BTW.
Good info(the 9 points), but as Rick Murchisom pointed out, completely off topic.
No, I disagreed with Rick already before my last post, but I have no need to pick a fight with the board's regulators. NetDoc's points were aimed at the newbie diver being given the idea that somehow the BCD is an emergency gas supply to be used whenever needed. Your callous disregard for hypercapnia (and hypoxia) is worrying.
But it's just obfuscation here, for lack of substance.
So you've read - or understood - nothing of what people are talking about? Lack of substance? Dear me ...
Absolutely. Inconsequential, that is. It's elevated CO2, or elevated seawater...
Weird choice. Actually there are others, and they've been mentioned. Please understand that elevated CO2 is no laughing matter.
You have to be alive to get a headache.
You may well end up with more than a headache ...
No different from any ESA.
Yes, surfacing the way you describe is different from any ESA. Ever wondered why submariners don't learn your technique? If it actually worked, it'd be a lot easier.
I find it odd that the nay sayers dance gingerly around the solo diving issue
I don't! I disapprove of solo diving, although I can see its use for certain forms of wreck or cave exploration. I'm absolutely against solo diving for OW newbies. There is no ambiguity here. And if I go on, somebody will split this thread, right? :boom:
I don't advocate teaching it to "newbies". Any certified diver has the same er, aegis, as you over what they wish to learn, regardless of experience.
Read that sentence again. Then again. Then a third time. It is the best example of an oxymoron I've seen for a long time ...