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This question may attract a whole load of 'flames', but here goes....
We have a group of experienced divers in the North West of England, all
with between 500 & 1000 dives each, who are currently diving some wrecks on the
North-East coast in the depth range of 55m to 65m. A typical target depth
would
be 63m. Dives are done using air as a bottom mix and using either 50% or 80%
Nitrox as a deco gas. All dives are done using an air computer & treating the
Nitrox as though it was air, to give an extra safety margin. A total deco time
of between 30 mins up to 1 hour is normal for each dive.
At present, divers are doing one 60m+ dive in the morning and following
a 6 hour surface interval, are doing the same 60m+ dive in the afternoon. Not
everyone is doing this but so far no one in our group has ended up in a
chamber.
One pair of divers on the last trip stacked over 5 hours of deco in 5 dives
over a 3 day period. There were no symptoms of decompression illness.
We are now moving over to Trimix diving because the nitrogen narcosis at
60m+ is unacceptable. So far, 5 divers are IANTD certified, with another 2 to
follow shortly. Current wisdom suggests that we should only be doing 1 Trimix
dive a day (which is what I will be doing). However, 'current wisdom' does not
advocate two 60m+ air dives in one day either.
So.....the $64,000 question...is there anyone out there with experience
with mutliple Trimix dives in a single day ? I had heard that some groups in
the USA might be doing this & would like some feedback, either positive or
negative on how well it works out.
I would really like to hear from divers who have been down this route
and have something to say. I do *not* want to attract a host of opionated
replies from people who haven't 'been there'...but who feel they want to make a
statement anyway. No doubt I will get some anyway...but try & restain
yourselves.
Regards, Steve M.
**************************************************************************
* * *
* Dr. S. G. Millard, * E-Mail : ec96@li*.ac*.uk* *
* Senior Lecturer, * *
* Department of Civil Engineering * Tel : 0151 794 5224 (UK) *
* University of Liverpool, * 44 151 794 5224 *
* PO Box 147, * (International) *
* Liverpool L69 3BX, * *
* UK. * Fax : 0151 794 5218 (UK) *
* * 44 151 794 5218 *
* * (International) *
* * *
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