I have had it 3-4 times and all occurrences were in low/poor visibility.I
believe,in my case,it is triggered by heavy sediment/particulate/plankton
bloom and  no visual or tactile reference.If I can touch bottom or the wall
it stops.Grabbing another diver vigorously by the throat also works.:)I dive
nitrox on a regular basis but these attacks were on air.I don't know if this
was coincidence or not.Focusing on gauges or my computer does not help.The
attacks were at depth or on ascent and were particularly severe.One case
resulted in an uncontrolled ascent to the surface.
I now will not dive in poor/low visibility.
-----Original Message-----
From: Thomas A. Easop <tomeasop@mi*.co*>
To: Tech Diver <techdiver@aquanaut.com>
Date: Wednesday, July 29, 1998 2:44 PM
Subject: Re: Vertigo?? Anyone else..


>I've had it 2 or 3 times. Usually when ascending at the shallowest point of
the
>dive, ei after 20 fsw stop. The spinning is characteristic. Sometimes
nausea is
>envolved. I just keep ascending slowly like I know I am, not how I feel I
am. I
>concentrate on not barfing until on the surface if I can help it. After
that I
>get to the doc who checks me for vistibular bends and barotrauma. For me
its
>been transient and benign.
>
>Nathaniel Fuster wrote:
>
>>      Just wondering who else on the list has problems with vertigo.
>>
>>      Vertigo is the dizzy feeling that often accompanies unequal
>>      equalization of pressure within the ears as one ascends or descends.
>>
>>      I've noticed that mine ONLY happens when I ascend too quickly (like
>>      going up a wall or a sharply rising bottom contour. It also seems
more
>>      prevalent when the viz is rather poor (but not always the case).
>>
>>      I generally have to hold on to something when it hits me, and remain
>>      motionless until it subsides (usually 20secs or so). It feels like
my
>>      surroundings are passing around me in circles, even though I
"believe"
>>      I am hanging motionless in the water.
>>
>>
>>
>>      Anyone else get this feeling from time to time?
>>
>>                                                 -Nathan..
>>
>>      Nathaniel.Fuster@gu*.br*.af*.mi*
>>
>>
>>
>>
>> --
>> Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>> Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
>
>
>
>--
>Guns and Armour of SCAPA FLOW
>1998 Underwater Photographic Survey of Historic Wrecks
>http://www.gunsofscapa.demon.co.uk
>
>
>--
>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
>
>
>

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