We didn’t know if it was humanly possible to reach the top of Mt. Everest. And even using oxygen as we were, if we did get to the top, we weren’t at all sure whether we wouldn’t drop dead or something of that nature.

I bought an oxygen tank, because with the global population at over seven billion people and rising, what if the world were to suddenly run out of air? And while the people will be suffocating, I’ll be the only guy prepared to pillage and loot.

Unfortunately, the sort of individual who is programmed to ignore personal distress and keep pushing for the top is frequently programmed to disregard signs of grave and imminent danger as well. This forms the nub of a dilemma that every Everest climber eventually comes up against: in order to succeed you must be exceedingly driven, but if you’re too driven you’re likely to die. Above 26,000 feet, moreover, the line between appropriate zeal and reckless summit fever becomes grievously thin. Thus the slopes of Everest are littered with corpses.

At three hundred feet... pressure... is ten times that at the surface. ...The organs collapse. The heart beats at a quarter of its normal rate, slower than... in a . Senses disappear. The brain enters a dream state.

Truebridge just dove thirty stories... all on one lungfull of air... The pressure... is more than ten times that at the surface, strong enough to crush a Coke can. At thirty feet. the lungs collapse to hald their normal size; at three hundred feet they shrink to the size of two baseballs. ...The dives don't look forced... as if they all really belong down there. As if we all do.

An ironic death for someone with a leaky space suit: too much oxygen.

If you don't leave home you suffocate, if you go too far you lose oxygen.

I went to Greece to write a story on ... When most people go underwater... they bail out at ten feet... ears screaming. The freedivers told me they'd previously been "most people." ...To freedive, they said, all anyone had to do was master the art of breathing.

Just look at freedivers... [A]t the World Freediving Championship [Seventh AIDA Individual World Championship] in Greece... [Y]ou see these people [of all sizes] from all walks of life,.. something like 30 countries had representatives... [T]hese people weren't born with these enormous lungs... They did this by... breathing and expanding their lung capacity. ...Once they explained to me ...the benefits ...go beyond just diving deep. It can allow us to heal our bodies (problems). It can allow super-endurance. It can allow us to do all these things that we've been told are medically impossible. ...I didn't believe them. ...I spent several years... talking to people at Stanford, Harvard... the leaders in the field in... this research, and what they'd told be is absolutely true.

Can one drown in one's element... If fish can drown in water, can human beings suffocate in air?

Was there no safety? No learning by heart of the ways of the world? No guide, no shelter, but all was miracle, and leaping from the pinnacle of a tower into the air? Could it be, even for elderly people, that this was life? — startling, unexpected, unknown?

I very nearly died. Of course, everyone thought I was acting, even the person doing the strangling. But actually I was dying. Luckily someone noticed the froth coming out of my mouth and knew something was wrong. I wasn't that spooked by the incident. But when they told me I had been out for a while, I wanted to make sure I wouldn't have any long term damage because I didn't know how long the oxygen had been cut off to my brain. But I was fine apart from a couple of rope burns. That's what happens when you take art to extremes.

The only thing we could do was fly until we ran out of gas and then bail out. It was dark, and we didn’t know anything about the terrain except that it was mountainous, but that was the only alternative, unless you wanted to commit suicide. We bailed out at around 9,000 feet.

The earth had more oxygen in the past than it does now. Now you kids are going to be told in textbooks that the earth had no oxygen at the beginning, when life was evolving, called a "reducing atmosphere." That is baloney! [...] It could not have evolved with oxygen, or without oxygen! But, if you double the air pressure and increase oxygen, not only does your hemoglobin take on oxygen, like it's supposed to, your plasma will get oxygen saturated, which means you could run hundreds of miles, without getting tired! Adam and Eve didn't need a car. They could run to grandma's.