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Hi Reima,
Sorry if this reply is a bit strange, but the text editor hates me.

I have no problems with narcosis at this depth range.  If I am diving deeper
then I practice any complex tasks before hand till they are automatic.  I try
to aviod having to make any decisions on the bottom.  For instance, I decide
on my gas turn points before entering the water.

For equipment I have a dry suit as do most of the deco divers in the area.
I use back mounted independent doubles 11.5 litre 240bar with DIN valves and
poseidon odin/jetstream regulators, fitted with stem gauges [tactile gauges].
All hoses for the right cylinder pass over the left shoulder and visa versa.
Between the cylinders I carry a 4 litre 200 bar oxygen cylinder, with normal
DIN valve and an Airdive brand oxygen regulator.  The second stage is wrapped
in a plastic bag [with a couple of holes in it] and jammed in an occy keeper
on my right hip.  I have to tear the bag open to use it.
The whole lot is held together with dive rite wings.  two seperate wing
bladders, the larger bladder is primary and the smaller jr as backup.
The primary bc hose comes over the left shoulder and the backup is held with
rubber to a fitting at the bottom of the backpac so it runs behind my back.
The backup timer and depth gauge is cable tied to the backup bc hose.
Primary depth and time is an Aladin pro on left wrist.  DRX tables are
written on my hand with water proof ink.
A spare mask and a signal float are carried in a mask pocket on my waist.
I use a half mask rather than a full face because I haven't figured out a
safe way of switching gases with a full face.  [One of the guys I dive with
died a couple of months ago and it may have been a switch mistake with a
FFmask]
I don't really have any problems with this type of diving.  I do it to relax
after diving all week at work.  The only problem I have is the fact that if
I let runtime go over an hour, the boat driver and the other divers get cross,
and all the gear costs a lot of money!!
I hope that if you are using a full face, you have some plan to deal with
hose bursts and such.  If you are using a band mask you should be able to rig
something up using the existing bailout block on the side, but remember to
test your nonreturn valves before every dive.
The TV stuff sounds fun, can you sell it to Australian TV so I can get a look?


Have Fun,

Jason :-)


> I'm a CMAS *** diver, originally cert back in -80. Most of my diving too is
> to wrecks in region of 45-51m. We use 2x10ltr-200 bar tanks, dry suit, full
> face mask and independent boyancy vest. I do wreck research and have done
> some wreck documentaries to Finnish TV.
>
> Since you work in similar range, I would be most glad if you could comment on
>     -How do you counter effect of narcosis,
>     -What type of equipment and redundancies do you use
>     -What do you feel to be primary problems in this type of diving?
>
> Good dives!
>
> Reima Raty
> Helsinki
> Finland
> Europe

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