Unfortunatly the answer I have is to use another program like Bryce or Vue to do this render. It is almost esential to have a program that does something in the way of fog, or volumetrics (particles in the air or in your case water) for an underwater scene. I'm sure it is somewhat possible in Poser, but I assume that it would be a diffucult task to get it just right. One way would be to put several planes with varing amounts of transparency (somone long ago did a water obj that used this) but you end up with a banding effect. To really get the depth of an underwater scene another program would make the task much easier, and I think you'd be happier with the end results. Remember, Poser is not a Raytracing program. Again you might also experiment with different planes and put different depth scenes on them again with transparency. But this is speculation on my part, as I do have several other programs that I'd use to make an underwater scene. I hope this isn't to depresing an answer. I have seen some very talented people here do some amazing things within Poser that one may have thought impossible. James