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Manos, people use what they have handy. The world is
(fortunately) not only the US (availability of diving gases,
industrial infrastructure, etc.). You know that most areas
in the world __do not__ have access to neither helium nor
trimix. Here (Canary Islands), there is not even nitrox
(although we are not cannibals anymore ;-). Most divers will
go down to 20-30 mts, some to 50-70 mts and a few even to
100-130 mts **on air**. It is a fact. People use air because
it is readily available and, unfortunately, there is _no
other choice_.
Who can pay 400 USD for a 50 m3 welding grade helium tank ?
That's what it cost here ... not really a choice ...
cheers,
aldo
aldo.solari@ho*.se*
www.ccbb.ulpgc.es/fish-ecology/solaris
___
cytech@ma*.co*.cy*
MM> Large steel deco tanks , wet suits and 18ltr on their
MM> back , " you name it " regulators .... and the story
MM> goes on and on ....
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