Just a diver
- Reaction score
- Mendocino, CA USA
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I absolutely love your commentsNever confuse simple with obvious or facts with understanding. Sometimes all it takes is looking at something from a different perspective for the latter to occur. Glad I can help.
If I did not change the default settings on a Shearwater before my normal dives in colorado or New Mexico, I would get a low PO2 warning breathing air on the surface.On a recent flight I took I looked at my Shearwater Perdix and it was flashing red showing a ppO2 of 0.16 at cruising altitude. You add a mask on top of alcohol and dehydration and no wonder some people are going nuts.
For technical dives, yes. Not sure about NDL dives though — they keep telling us that it’s a safety stop, not a decompression stop. Apparently there’s a big difference (yes of course there is!)I'm not so sure the effect of extending a safety stop on air or nitrox will have as little effect as you imply. I believe there have been studies (DAN?) that attempted to compare the effects of various safety stop lengths on bubble formation. If I recall, longer stops were found to reduce bubble formation but with diminishing returns, so the recommendation continues to be for a 3-minute safety stop.
I was diving with someone the other day who had to drive to an altitude of about 800m afterwards. In order to reduce his risk he decided to extend his safety stop on the final dive from 3 minutes to 7. This was at 5m.
He reckoned that you offgas faster under slight pressure. Something to do with increased circulation and having a greater number of small bubbles instead of a small number of large bubbles.
Does anyone agree with this? Any articles or science papers that have tested this?