Is this dangerous?

[islanderman]

I watched a video recently about a man testing CO2 saturation in soda. The link is this:
[ame=http://www.youtube.com/watch?v=J6YO5RGjKJQ&feature=channel&list=UL]Drinking underwater -26m deep - YouTube[/ame]
He tests the saturation by swimming to several depths to see if the co2 bubbles appear or not. To me, it appears he swims to an air box at -26m and breathes freely. At -26m there are no bubbles in the soda due to the air pressure in the box being pressurized by the surrounding water. Wouldn't breathing the pressurized air w/o decompressing on ascent hurt you?

 

[Simos]

I watched a video recently about a man testing CO2 saturation in soda. The link is this:
Drinking underwater -26m deep - YouTube
He tests the saturation by swimming to several depths to see if the co2 bubbles appear or not. To me, it appears he swims to an air box at -26m and breathes freely. At -26m there are no bubbles in the soda due to the air pressure in the box being pressurized by the surrounding water. Wouldn't breathing the pressurized air w/o decompressing on ascent hurt you?

How do you know what he does on ascent? It's not in the video.

It's not so much the decompression but the expansion that would cause barotrauma - however on descent he seem to breathe from a regulator so I am assuming he'd be doing the same on ascent...

 

[islanderman]

I didn't pay attention on the descent and didn't see the regulator Sorry!

 

[Simos]

I didn't pay attention on the descent and didn't see the regulator Sorry!

Nothing to be sorry about! I was just asking...

 

[Tony Babowicz]

This is a fellow DB'er Goes by the name "Sofabike" . Send him a pm and lets get some input from him.

 

[TomW]

Air from a regulator with scuba gear will be at the same pressure as the air in the box which is at the same pressure as the water, so it will be no different from normal diving. As long as he breaths out on ascent to release the air then he will have no problems from lung over-expansion. And in terms of decompression he only went to 26m (85 feet) for a short time well within the limits for a no-stop dive. While in reality he would probably not suffer any ill effects if he had gone straight to the surface it is recomended that a stop at 5m for 3minutes is taken as a precaution.

 

[Antoine]

As tom said, It would only be dangerous if he held his breath whilst ascending. The air he would have breathed at a depth of approximately 30 metres underwater would have been at a pressure of 4bar/ata. Whilst ascending the air in his lungs would have expanded significantly as the surface pressure is one quarter of that in the air-box. This would have caused him to have a barotrauma, also known as lung over-expansion most probably leading to a lung rupture-a very serious problem which is potentially fatal.
However, since he is still alive, and I am assuming well, he would have exhaled whilst ascending thus ensuring that his lungs did not overexpand with the decrease in pressure.

 

[Simos]

The other thing that it dangerous (as a general point) is that it's a bad idea to breathe air trapped in such spaces (eg in caves) as you really don't know what exactly you are breathing, for freediving it can be even worse