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| Originally Posted by Mark Chase Why the hell you lot cant get your head around the fact I am talking from a personal perspective I have no idea. |
Because you're wrong, just accept it
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CCR of course, is a totally different ball game. In board gas can be run semi closed. We have all been taught 4:1 ratio SCR. More experienced CCR divers have no doubt done what I have done and seen just how long it takes to breath down 1.3 to 0.4.
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Do an hour or two's swim SCR and see how you feel at the end of it. I'd rather go OC, it's absolutely exhausting, it takes a lot of focus, it screws your buoyancy up...
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So OC bailout ignoring the CCR will give me an hours breathing gas.
Assuming stress virtually doubles my normal SAC to 20 I have 48mins
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So on OC you will be stressed and your SAC is through the roof. Why isn't the same going to be happening on SCR? So you're stressed, you're breathing hard, you're sucking on an ADV that feels like giving someone a blowjob down a mile of garden hose every 4 breaths all whilst swimming, all whilst trying to find your way home, all whilst your buddy is swimming along happily thinking "what a cock, why doesn't he just bail out?"...
I've had a RB failure 2hrs from air and I nearly inhaled my drysuit through my arse. I didn't give a flying f**k what I was breathing as long as I could breathe it. Psychologically, once I was on OC there was no way I could have come off it to go back on SCR. And psychologically there was no way I was about to go through some mental checklist about how to stay on the loop. I needed to breathe something, I needed it NOW and once I'd got it you'd have to pry it off me to get me to take that 2nd stage out of my gob and put a DSV in.
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BUT I hear you scream, what about a total unit flood?
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Not really, that's what OC is for
And in my very limited experience of swallowing lime I'd be very unlikely to stay on the loop where I don't always have control of my position -- you point where the cave points you.
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Simple, Buy a unit that doesn't generally flood and has excellent flood recovery.
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Erm... weren't you diving a KISS? Not exactly flood resistant/recoverable.
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So my conclusion as a total novice who dont know s#it about caves (but as a CCR diver with 4-500 hours experience) is that CCR greatly expands your options on bailout and straight OC bailout is both limited in application and of only limited significance to a CCR diver who dives the right unit.
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OK, what about a CO2 hit underground? OC still of limited significance?
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Why do i need another course to lern this, I did it in PADI AOW.
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Well, you did the course so why did you need to re-learn it?