JoeL,

As long as you have a working light and there is water flow, you will have
visual cues. Hold the light right up to your mask. No matter how chocolate
babyshit whatever, the light right up against your mask will allow you to
see the movement of particles. Certainly if there is no perceptable water
flow then this is a mute <sic> point. This is not hearsay. This is my
experience.

On Mon, 8 May 2000, Joel Markwell wrote:

> on 5/8/00 2:43 PM, John R. Rose at rose@CS*.SC*.ED* wrote:
> 
> > 
> > You really need to try one of these in crap visibility with tanic stained
> > lines. The HID light is incredible. It is as though it slices through
> > crap water and locks onto the line without all the backscatter you would
> > see with a normal bulb. If you are imagining this as simply a brighter
> > then you are mistaken. Extrapolation from what you've experienced with
> > standard bulbs doesn't hold.
> > 
> > BTW, I can't imagine why you would want to close your eyes, particularly
> > if you are suffering from vertigo. The way to deal with vertigo is to find
> > some visual cue. The movement of silt that you can see half an inch or so
> > from your mask with your light on is such a cue. The last thing you want
> > to do when suffering vertigo is to close your eyes.
> 
> John,
> 
> Again, crap vis isn't no vis. Doesn't anyone read anymore?
> 
> Bright, yes, slice through "crap vis", sure. Offer any help in
> NO-VIS/ZERO-VIS/CHOCOLATE-MILK-VIS I am as yet unconvinced of and as yet no
> one has stated flatly that with an HID light you can see _through_ the
> above-stated conditions in any useful way.
> 
> BTW, I've seen the HID light in use, underwater, in caves.
> 
> As to the best way to combat vertigo, I have always been taught that when
> visual cues are lacking to the extent that your eyes are useless, that
> closing them can be helpful in recovering your equilibrium. What that is, I
> don't know. IF that is, I can't say. If you HAVE no visual cues, what then?
> 
> Other input other than hearsay would be appreciated.
> 
> Later,
> 
> JoeL
> 
> 

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