Doesn't surprise me that the French would be among the leaders here. They
started the whole aqua lung apparatus. My dad's scuba teacher (LA county
instructor) certified in France. They made him use their
equipment. Double hose, had to swallow the seawater to purge! This was
back before 1960.
What do you go that deep to see? You will need some really good lights at
that depth. BTW, what is your down time? When I was a volunteer fireman,
we used fiberglass tanks that weighed much less. Because of all the gear
and stress, most could only get about 15 minutes from a 1500 cubic inch
tank. You wouldn't get many photographs at that rate!
gregg
>Comex (french comercial diving operation) have gone to 701m (in a chamber,
>breathing a hydrogen-oxygen mix) and regularly do working dives at 300+ m
>-- as do the US navy.
>
>Me, I only occationally go below 60m since the expenses of Helium as well
>as the logistics (you need lots of gas at depth) are quite extensive and
>air just is nasty below 60m. Below 100m, and you need excessive amounts of
>logistics in place, and it's hardly worth it for just recreational diving
>-- 60-100m is possible, but only worth it if there really is something to
>see. Still, in those cases where there is something worth going down for,
>it's probably also worth photographing.....hence.....
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