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Eric, =09Just a small bit to add that I haven't seen any others add. I have been with divers who were hit hard by narcosis on dives that we had done previously and had no problems with. Reviewing some of the instances we came up with the following observations: They were more likely to get narced if they were short on sleep (already mentioned by one other respondant), They were more likely to get narced if they had been out drinking the night before (they told me of the drinking after we had completed the dive), they were more likely to get narced if they were dehydrated from a hot day on the shoreline. =09These dives all occurred in a lake in NW Arkansas where I do my students checkout dives. The dive site has a ledge that the students don't go over but that leads to an underwater forrest with typical water temperatures in the lower 50s. Visibility is usually 20 - 25 feet but the light level is typically low from passing through a couple of thermoclines. The depth of the narcosis hits has been around 100 feet in a lake that is at 1120 feet above sea level. We have done many dives to this site and usually don't have anyone get narced but have had at least 5 instances where we terminated the dive due to uncomfortable feelings on the part of at least one of the divers. All of these divers are experienced Assistant Instructors with at least 50 dives or more and many hours underwater in our 17 foot deep pool in addition to the 50+ openwater dives.=20 Hope this helps. Alan Chapman=09=09=09=09=09NAUI #10476 achapman@co*.ua*.ed*=09=09=09=09NREMT University of Arkansas Fayetteville =A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5= =A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5= =A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5= =A5=A5 The date that you truly stop learning will be the date printed on your=20 death certificate!!!! =A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5= =A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5= =A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5=A5= =A5=A5 On Tue, 21 May 1996, Eric Mieczkowski wrote: > I've been diving now for about six years. In that time I've been narked= =20 > only twice, but I'm a bit puzzled about the circumstances. >=20 > Both times narcosis set in at about 120 feet. Both times were while=20 > diving Gilboa Stone Quarry. The puzzling thing is that I've been past=20 > 120 numerous times at other places without problems. I know narcosis=20 > doesn't follow very well defined rules, but is this normal? >=20 > It concerns me because I'm not one of those who gets happy or euphoric.= =20 > I get pretty paranoid, and my buoyancy control goes right out the=20 > window. This last occurance was just this past weekend. I was fine=20 > right up to 120 feet. Or at least that's when I recognized it. I=20 > realized that I was very nervous, and decided to head for the down line.= =20 > By the time I hit the line, only a few feet away, I had ascended 17=20 > feet and set off the ascent alarm on my computer. >=20 > I am normally a VERY cool headed diver. I have been in at least two=20 > emergency situations. One involving a buddy and one myself. Both times= =20 > I coolly handled the problem and calmly made a safe ascent, including a= =20 > safety stop. Both were near out of air situations. That's why my loss= =20 > of nerve, and more critically control, bothers me so bad. >=20 > What kinds of things contribute to Narcosis? Are there any steps I can= =20 > take to reduce my risk of Narcosis? Is it normal to hit it at 120 one=20 > day and not at 140 the next? >=20 > Incidentally, I'm planning on taking courses next year in Technical=20 > Nitrox and Trimix. Will trimix help solve the narcosis problem at=20 > depths beyond Nitrox's shallower limits? >=20 > Any advice would be readily welcomed. >=20 > Thanks, >=20 > Eric Mieczkowski > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >=20
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