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The 40 metres thing is a restriction on sports diving or recreational diving I think they call it.
Sports diving doesn’t condone decompression diving, beyond mandatory 3m6m stops.
Diving on air you have very little time at 40 metres without lengthening your decompression times once you get up to beyond ten metres.

Technical diving on something like trimix involves reducing the oxygen and introducing helium instead so you can go deeper, but the article you included explains the limitations for this site because of the number of bottles you would need to bring down beyond 55 metres and the length of the decompression stops that would be involved.

Basically every 10 metres of water is equivalent to one atmosphere at sea level. So the greatest increase in ambient pressure is in the first 10 metres. Pressure is doubled on the body.
There is 21% oxygen in normal air mix. This is measured as partial pressure of 0.21
The thing is oxygen becomes toxic to the body at a partial pressure of around 1.4
This means diving on air at around 60 metres is highly dangerous as you are at 7 atmospheres of pressure.

Tech diving is very specialised and extremely dangerous too. They reduce the oxygen to reduce the partial pressure but you can suffer from nitrogen narcosis which can render you….. well dopey.


So you can see that no matter what way you look at it, free diving is living on the edge for everyone involved. It really must be a drug. Adrenaline junkies.
The world apnea records are staggering.
 
Just binge watched Unchained tour de France on Netflix.don’t really understand the team aspect of it always thought whoever came first in the stages won.Really interesting the way the riders are treated.Some of the crashes are mad,and the scenery is amazing
A must for any cycling fan or even those with just a slight passing interest. Brilliantly made doc.
 

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