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"Hello World!"

I'm a Nordic CMAS *** diver. I do wreck dives in Baltic Sea in 40-50m
region. Due to darkness in these depths we suffer from narcosis more
than in clear "southern" waters.

1) Since I'm not exposed to mixed gas diving: What in your opinion would
be the optimum gas mixture to these depts?

2) What kind of in-water precausions and equipment do _you_ use for
   this type of dives? DSMB:s, ponies, deco tanks? These seem to 
   differ alot around the world.

3) Do you have experience with UW communication between 2 divers?

Background:
We usually use 2*6 or 2*7 liter (hello Jouni:) 300 bar tanks, Viking-
type dry suits, self-containing horse collar and some use AGA full
face masks.

Greetings!

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