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This is a terrific, terrifying article about Free Diving. Well worth the read.
via +Matt Uebel

"Further still, at 150 feet, you enter a dream state caused by the high levels of carbon dioxide and nitrogen gas in your bloodstream: for a moment, you can forget where you are and why. At 300 feet, the pressure is so extreme that your lungs shrink to the size of oranges and your heart beats at less than half its normal rate to conserve oxygen. You lose some motor control. Most of the blood in your arms and legs has flooded to your body’s core as the vessels in your extremities constrict. Vessels in your lungs swell to several times their normal size so they won’t be crushed by the incredible pressure."
James Nestor reports from the 2011 Freediving World Championships. Nestor reports on freediver William Trubridge & others at the 2011 Freediving World Championships.
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5 comments
 
These people are amazing! Thanks for sharing!
 
Does anything happen to the eardrums? I wonder.
 
I'm lucky if I can get to the bottom of the shallow end of the pool.
 
This is really extreme. The Free Fall YouTube clip is extraordinary. A great read and really engaging.
 
+Kathleen Gick You're welcome :)

+Chester Moy I'm not sure. I think most divers are trained to 'clear' their ears (similar to how we do it whilst on a plane) periodically. Apparently with practice it is possible to close the nostrils hands-free by contracting nasal muscles.

+Dean Reimer Hah, me too. I can swim, but I cannot reach the bottom of the pool, I always float up awkwardly.

+Doug Stetson Yes! The video was amazing. Anyone who hasn't seen it yet should def watch it: Guillaume Nery - Free Fall
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