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| Originally Posted by NotDeadYet Yep, it's similar to why a mix with 10% O2 is breathable at 6m but on the surface will have you on your back. Pressure "artificially" bumps the PO2 up to a level that maintains conciousness, take away the pressure and you take away that boost. |
Indeed, that's it - thank you.
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Golden rule, never hyperventilate
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I completely agree.
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I stopped doing a lot of the apnea tables training because one their aims is to build tolerance to elevated CO2. I'd started freediving around the same time I started diving on a rebreather and thought the last thing I want is to become tolerant of CO2. I want the warning signs nagging at me.
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That's something I'd never considered, seems sensible though. Still as a basic single tank diver probably not too much of an issue for me.
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Big thing I struggled with was equalising. I can sort of half manage a frenzel which helps.
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That's the major reason that I couldn't get any further - not ears but sinus's, they just take a while to equalise and hurt if I push it too fast. This just means nice slow descents in scuba but is rather more of a problem in freediving. I had a small amount of blood in my mask after a couple of my training dives, so once I'd reached my qualifying depth we decided I should call it a day and I haven't really pushed it since.
In addition scuba and freediving don't mix too well in a short space of time and if I am somewhere where there are things to see underwater I tend to be doing at least one scuba dive, usually early in the day. Following that with popping up and down freediving would be a bit like shaking a bottle of lemonade!!
I've just realised I've managed to hijack a thread in the DIR section
I wonder how many freedivers we have lurking on this forum...
