need some help creating an underwater scene
 

hi,i want to make just some fish swimming underwater .i dont find a good underwater shader and i dontknow how to make the effects left by the fish on the water...i also would like to make the effects of someno putting his face down the water and taking out of it...i fsome one knows something i would be so thankful if he tells me...you can also emailme to carlulu@gmail.com...haea nice day.
carla