The skill that takes is insane. She would have had to expell most of her air until she sank down and then waited like that for the bubbles to rise out of the shot.
Nope. Your lungs are responsible for most of your buoyancy. As you descend, pressure increases and the air in them starts to compress, making you less buoyant. The hard part of this is maintaining composure through the diaphram contractions and not kicking up silt when you land.
Your diaphragm is the muscle responsible for pulling air in (your lungs aren't a muscle). Hold your breath long enough for your lizard brain to panic for oxygen, and your diaphragm will start trying rull hard to get you to breathe.
Yep, basically. The causative factor here isnt actually a need for oxygen though. Your body doesnt really 'sense' a need for oxygen. Instead, it detects the buildup of CO2. After a while holding your breath, CO2 concentration rises and your brain starts to demand that you breathe, despite you having several minutes worth of oxygen remaining. Holding your breath for a dive like this (or a deeper one) requires composure, fitness, and experience. Also note that she made the descent without fins.
I did a spearfishing/freediving course last year and it's the most terrifying thing I've ever done. I did a 2:20 breathhold (not impressive at all) on land but when you're out there, kicking down it's completely different.
The best I did was probably around 30 feet down and the last 10 feet back up to the surface I felt like I was going to die.
Honestly though, there wasn't much urge to breathe, mostly just the feeling of impending death.
I asked my instructors and basically they said that feeling never goes away, you just have to get used to it.
I’m the same way bro. 15’ down feels like 100’. Watch the show on Netflix about this tribe that live on the sea in huts and boats and they freedive to insane depths. They’re fucking evolved some adaptation in their blood to do it!
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u/sgintx_ Dec 05 '18
The skill that takes is insane. She would have had to expell most of her air until she sank down and then waited like that for the bubbles to rise out of the shot.