Posted by Kendall Raine on March 23, 2001 at 08:20:18:
In Reply to: Why not 40% O2 and 60% He? posted by AADIVER on March 23, 2001 at 07:37:29:
O2 + He=Heliox. You can use it. The commercial guys all use Heliox for intermediate depths and switch to trimix only below about 500-600 fsw to ameliorate HPNS.