Untested for water, but just an idea, create a box under the plane
containing the media of choice large enough to cover the volume you need.
I've played with something similar for dusty air in a room illuminated
through a blue glass window.

Maybe:
box { <-10,-10,-10>,<10,0,10>
    texture {
        pigment { color <1,1,1,0,1> }
       finish {
         ambient 0.0
         diffuse 0.0
         reflection 0.0
        }
    interior {
       media {
       scattering {
         2 <0.5, 0.65, 0.4>
         extinction 0.5
       }
}


"Bryan Heit" <bjh### [at] NOSPAMucalgaryca> wrote in message
news:43d4f916$1@news.povray.org...
> Marc Jacquier wrote:

> > news:43d29536$1@news.povray.org...
> >
<snip>
> That has helped a little, but I'm still not getting exactly what I'm
> looking for.  Now I get an error about my camera being inside of an
> object filled with media, and that this may make the media not work
> properly.  This is defiantly the case - my scattering media no longer
> scatters, giving (in essence) unlimited visibility underwater.
>
> Any suggestions?
>
> Thanx
>
> Bryan

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