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> 
> Some time ago I heard a presentation by a professional diver at my University
> on his experiences during a >400m (I think) Trimix chamber dive in Norway.
> This dive was made in the early 1980:ies and at the time it was (an still is?)
> the deepest trimix dive  made. They experinced serious symtoms when they
> switched from trimix to heliox. Two of the three divers were conviced that
> they had yellow birds inside the chamber after the switch.
> 
> Sten Meyer

glad this subject came up:

i heard in conversations at tom mounts that studies also found that in
these deep chamber dives heliox alone caused the red blood cells to
become rigid, causing minor damage to the smaller capillaries.

but when even minute amounts of nitrogen was introduced to the breathing
medium the cells softened back to normal...

any comments..

dennis

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