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| Originally Posted by WannabeMermaid but that's why it's more common at shallow depths than deeper in the dive. |
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.
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However, you can still do that and you can do it quite easily swimming horizontally in the pool especially, as someone mentioned, if you hyperventilate beforehand, you remove more CO2 than you gain O2 so you don't get the trigger to breathe when you need to.
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Golden rule, never hyperventilate. I know I've done it when I've got a bit of a metallic taste in my mouth, I don't know why but I get pain in my temples as well if I hyperventilate.
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It made me realise how easily it's done, especially when you start training yourself to overcome the urge to breathe.
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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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Mind you - I still only just made my 18m dive I needed to qualify, 25m is still beyond me!!
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Big thing I struggled with was equalising. I can sort of half manage a frenzel which helps.