10% oxygen, 90% helium would be perfect.  

----------
> From: John E. Ivanic NACD#1648 <ivanic@di*.ne*>
> To: cavers@cavers.com
> Subject: break gas
> Date: Friday, February 12, 1999 2:59 PM
> 
> I was just reading the latest edition of deep tech, and read the article
> on the boy's that were diving in merimac cave system.
> One of the fellows said he used 20/20 trimix for break gas, I was
> wondering what the advantages  or disadvantages are. I understand that a
> lower O2% would be good, but what about the 20% He?
> 
> John Ivanic      comments:  ivanic@di*.ne*

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