Open Your Mouth, And You're Dead
I tripped across this article concerning the 2011 Free Diving World Championships.
It's a long article, but, I think, well worth your time. Very interesting. These guys (and girls) are nuts if you ask me. Open Your Mouth, And You're Dead, from outsideonline.com. Quote:
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"...possibly crazy..."
That editor sucks. Or they need better fact-checkers. |
No way. You have two things against you there: nitrogen narcosis and compression. Oh, and breathing.
You can't just shoot to the top. They didn't say anything about decompression. If you're not using equipment you can't stop at the intervals needed so you don't, like, die. I call poppycock. ;) http://en.wikipedia.org/wiki/Deep_diving Quote:
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40 feet/12 metres Recreational diving limit for divers aged under 12 years old and beginner divers. 60 feet/18 metres Recreational diving limit for divers with Open Water certification but without greater training and experience. 100 feet/30 metres Recommended recreational diving limit for divers.[1] Average depth at which nitrogen narcosis symptoms begin to appear in adults. 130 feet/40 metres Absolute recreational diving limit for divers specified by Recreational Scuba Training Council (RSTC) Maximum depth reachable by a French level 2 diver accompanied by an instructor (level 4 diver), breathing air. 180 feet/55 metres Technical diving limit for "extended range" dives breathing air to a maximum ppO2 of 1.4 ATA. 200 feet/60 metres Maximum depth reachable by a French level 3 diver accompanied by another level 3 diver, breathing air. 218 feet/65 metres Depth at which compressed air results in an unacceptable risk of oxygen toxicity. 330 feet/100 metres Technical diving training limit for divers breathing trimix. Recommended technical diving limit. 509 feet/155 metres Record depth for scuba dive on compressed air. 660 feet/200 metres Absolute limit for surface light penetration sufficient for plant growth, though minimal visibility possible farther down1,083 feet/330 metres World record for deepest dive on SCUBA 2,000 feet/610 metres Navy diver in Atmospheric Diving System (ADS) suit |
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Dangers? Sure. Hyperventilation is a big one. That's when you essentially blow off the carbon dioxide to below the normal level during normal respiration. It's the presence of CO2 that gives you the urge to take a breath. By artificially changing that level, you "trick" your body into thinking you don't need to take a breath. Yeah, these folks are nutzo. |
But this isn't SCUBA. They take a breath of air, and go down, it's compressed, and when they come back up it expands to the size it was originally.
With SCUBA, you breathe compressed air down below, and you come up fast, and it expands and you burst. EDIT: what V said |
I don't believe it, that's what I'm saying.
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What I have trouble wrapping my head around is swimming that distance on one breath. Going down, sure. Swimming back up? How?
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We took a can coolie to 110 feet. It was roughly as big around as a pencil at that level.
So these folks are wanting to go to 800 feet? Oh, film it, I'd love to see a body cave in on itself. |
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Back in the day, yeah. Horizontally. On the surface. At swim practice that was cool/fun, but not especially superhero. Four laps and make it snappy! |
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When you're at depth the air in your lungs is at the same pressure as the surrounding water. If you're breath holding from the surface the air is still pressurised , it just reduces in volume, the risk of narcosis and bends are the same.
It takes time for nitrogen to be absorbed into tissues, just as it takes time for them to be released, the time spent at depth is very small, so the bends are unlikely. I don't rememeber if narcosis is also time related but I rememeber them saying it's something you can get accustomed to, like drinking. Only the air spaces in the body are subject to volume change, at 300m you lungs would be 1/30 th the size ! I skimmed the article and didn't find any reference to "open your mouth and your dead', maybe it's in the video, but since pressure it equalized it shouldn't matter if you open your mouth. |
Has anyone else seen The Big Blue?
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WACKY
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Free Diving |
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