Man survives in sunken ship for 3 days: Scares divers

Diver retrieving dead bodies from the wreckage of a sunken tug is scared witless when a hand reaches out to grab him (@5min30sec). ...rescue ensues.
More here:
http://videosift.com/video/Man-survives-three-days-trapped-under-sea
grintersays...

The recovery diver is using a Heliox (helium plus oxygen) gas mixture. Normal air is mostly nitrogen and oxygen, but both of those gasses can cause problems under the extreme pressures of deep dives. Nitrogen at high pressures makes you drunk ("nitrogen narcosis") and oxygen can be toxic.
In Heliox, the nitrogen has been replaced by helium, avoiding the drunkenness at the cost of a high-pitched voice. Concentrations of oxygen are also usually lower, reducing oxygen toxicity.

Sniper007said:

Also, why are the voices high pitched?

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