Found it. Of course the your choice of type 2 would probally be better for
water. The photons block is for my glass windows from my scene that
refracted the light coming through. Just another afterthough, you might be
able to use the density block to create thicker "clouds" in the water. I'm
not sure of your exacts goals of the scene, but I hope this helps.

#declare Dusty = box { <-21,0,-21>,<21,21,21> }

object { Dusty pigment { color rgbt 1 }
photons { pass_through }
hollow
interior {
media
     { scattering { 1, 0.07 extinction 0.01 }
       samples 30,100
     }

}

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