kottke.org posts about free diving

The "impossible" science of free divingMar 26 2015

This article on the science of free diving is fascinating. Boyle's Law predicted that the human body couldn't survive depths past 100 feet -- after which, the lungs would rupture -- but millions of years of evolution has equipped the human body with all sorts of tricks to survive at depths of over 900 feet.

Lundgren, among others, demonstrated how these phenomena might counteract Boyle's law. He recruited volunteer firemen from a fire brigade in the Swedish city of Malmo, submerged them up to the neck in water, and used a heart catheter to measure the increase in blood circulation in the chest. Lundgren discovered the body was able to counteract the increased outside water pressure by reinforcing vessels in the walls of the lungs with more blood, in much the same way we increase tire pressure by adding more volume of oxygen to the inside of a tire.

Boyle's Law had not been overturned. Scientists simply hadn't taken into account the effect this counterforce could exert to allow survival underwater. "A lot of blood, much more than was usually thought, can be transferred from the blood circulation out in the tissues into the blood vessels of the lung," Lundgren said, placing that amount at about half a gallon. The extra, densely packed blood can act as a bulwark, exerting a counterforce against the increased pressure pushing inward by the water.

Ocean GravityFeb 05 2015

Free diver Guillaume Néry looks like an astronaut floating around in space in this underwater video.

See also this surrealist free diving video and Néry's underwater base jump. (via ★interesting)

Surrealist free diving videoOct 06 2014

Is this the first surrealist free diving video? I wasn't sure and then Superman showed up.

The 1000-foot free diveSep 01 2010

World champion free diver Herbert Nitsch is planning on executing a no limits dive to 1000 feet. That's 300 feet more than the current record set by Nitsch three years ago.

(via @dunstan)

Crazy underwater base jumpJun 08 2010

Guillaume Nery is a world champion free diver; here he is "jumping" from the top of Dean's Blue Hole and falling towards the bottom. No tanks or anything.

Insane. According to the info on YouTube, Nery's jump was filmed by free diver Julie Gautier, who was also holding her breath the whole time. Insaner!

Attention deconcentrationAug 24 2009

It's a bummer that Alec Wilkinson's article on free diving isn't available online (except for NYer subscribers)...it's fascinating and right up the alley of the relaxed concentration/deliberate practice enthusiast. One of the two divers profiled uses a technique called attention deconcentration to govern her body and mind as she dives.

To still the unbidden apprehensions that might interfere with her dive -- what she describes as "the subjective feeling of empty lungs at the deep" -- Molchanova uses a technique that she refers to as "attention deconcentration." ("They get it from the military," Ericson said.) Molchanova told me, "It means distribution of the whole field of attention -- you try to feel everything simultaneously. This condition creates an empty consciousness, so the bad thoughts don't exist."

"Is it difficult to learn?"

"Yes, it's difficult. I teach it in my university. It's a technique from ancient warriors -- it was used by samurai -- but it was developed by a Russian scientist, Oleg Bakhtiyarov, as a psychological-state-management technique for people sho do very monotonous jobs."

I asked if it was like meditation.

"To some degree, except meditation means you're completely free, but if you're in the sea at depth you will have to be focussed, or it will get bad. What you do to start learning is you focus on the edges, not the center of things, as if you were looking at a screen. Basically, all the time I am diving, I have an empty consciousness. I have a kind of melody going through my mind that keeps me going, but otherwise I am completely not in my mind."

I found only one other reference online to attention deconcentration, an article on free diving written by Natalia Molchanova herself. In it, she talks about the three types of attention deconcentration: visual, aural, and tactile.

Rising from the depth, it is important to constantly scan your condition to prevent shallow water black-out, which can occur without any discomfort sensations. Somatic attention deconcentration appears to be extremely useful in this situation. Somatic AD implies attention distribution on the whole volume of the body and allows noticing tiny changes of organism state.

There is one more kind of AD -- aural attention deconcentration. It is not so effective in the water, but it helps preparing to the dive and not to be distracted by judge's countdown.

It's interesting that both the attention deconcentration and flow techniques are designed to get the practitioner to basically the same place (i.e. ready to perform difficult tasks) from opposite directions.

Somewhat related, a reader (thx, martin) recently sent in a link to The Game, a mind game with an unusual objective:

The Game is an ongoing mind game, the objective of which is to avoid thinking about The Game itself. Thinking about The Game constitutes a loss, which, according to the rules of The Game, must then be announced. How to win The Game is not defined in the rules; players can only attempt to avoid losing for as long as possible. The Game has been described alternately as pointless and infuriating, or as a challenging game that is fun to play.

Update: Sad news. Natalia Molchanova failed to surface after a dive in the Mediterranean Sea and is presumed dead.

Tags related to free diving:
sports video Guillaume Nery

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