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On Tue, 20 Jun 1995, Paul W. Smith wrote:

> The Wakulla Project book had an example of differential He loss, if memory
> serves. It seems that someone had a slight manifold leak which allowed He
> but not the other gases to leak out. This produced a tri-mix which was lower
> in He and proportionally higher in O2 and N2. Very bad news when diving 
> to 250+ ft for extended periods. Close call.
> Double check those mixes like the man says...  Paul

May I propose an experiment to show the difficulty to contain helium.
Take an empty plastic bottle (Coke, Pepsi, or whatever). Flush it with
helium. Put the cap back on. Wait for a few days up to some weeks.
Look at the bottle! You will be amazed. 

/Sten Meyer                   m87stme@mt*.ch*.se*

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