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- Path: sparky!uunet!stanford.edu!agate!darkstar.UCSC.EDU!cats.ucsc.edu!jdale
- From: jdale@cats.ucsc.edu (Jonathan Dale)
- Newsgroups: rec.scuba
- Subject: Re: dangerous misconception (was Re: Human bodies explode...)
- Date: 16 Nov 1992 19:48:02 GMT
- Organization: University of California; Santa Cruz
- Lines: 45
- Message-ID: <1e8ttiINN6s7@darkstar.UCSC.EDU>
- References: <1992Nov16.074547.5322@nntp.uoregon.edu> <1e8dgiINNafa@transfer.stratus.com>
- NNTP-Posting-Host: si.ucsc.edu
-
-
- In article <1e8dgiINNafa@transfer.stratus.com> gd@gehenna.sw.stratus.com (Greg Dawe) writes:
-
- >On a more technical note, it's not completely accurate to state that "anybody
- >diving to 200' and deeper is going to be SERIOUSLY narc'd". There are some
- >divers who are able to function well at 200 FSW, and a rare few, who can
- >function well even deeper. These divers have been diving deep on air for
- >years, and have developed some tolerance for the symptoms of narcosis. They
- >also understand their body's limitations while "under the influence" and don't
- >stray too far from the anchor line, nor do they exert themselves.
-
- >This tolerance, or adaptation is finite. It has a "bottom" (as opposed to
- >a ceiling), and can be lost if the diver doesn't continue to dive deep.
- >In areas of seasonal diving, such as New England and Long Island, deep divers
- >spend the initial part of the season diving progressively deeper to regain
- >their deep adaptation/tolerance.
-
- I would question this whole tolerance concept. Based on what I've been taught
- and my personal experience, it seems that nitrogen narcosis affects mainly
- judgement and creative thinking. It tends NOT to affect performance of
- routine acts. Thus, an experienced diver who has been diving recently so
- everything is fresh in his/her mind will be able to do a deep dive, no problem,
- as long as nothing weird happens. But, we have had people here -- an
- instructor, even, I think -- mention that they were completely unable to
- comprehend an unusual flashing light on their console while they were at depth,
- and they just sat there for several minutes until the console gave a more
- clear message (it said "GO UP"). I also know people who do deep research
- (~100') who do fine at depth, but who were unable to make decisions down
- there (in this case, they were unable to decide which camera to use, and had
- to abort the dive).
-
- One of my classes went to 110' to do math problems, simple addition and
- subtraction. Some of us got them all wrong. Myself, I got everything right
- and felt fine -- sounds like natural tolerance, right? That's what I thought,
- down there. I wasn't till I realized how long it was taking me that I
- realized that something was up. You can be very solidly fixated on something
- and do it all perfectly, and not even notice the weirdness. How can you notice
- when your sense of time is altered? I think a lot of these people who think
- they are immune or tolerant are just not noticing, and they won't notice until
- they're forced to think, or react to totally new circumstances, and then
- they'll be in as much trouble as the rest of us. More, actually, because
- they're overconfident.
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