sjlocke: The point of the work is to get the shark to appear like it's swimming in the ocean, so let's keep the comments geared toward that subject and try to be more respectable. Thanks.
gohan: I've got a nice tutorial on that subject that I can't find at this moment. When I do I will post it here for you. However, you may have to create two seperate scenes. One with the light as it is above the water and one with the light as it is below the water. Then, in After Effects, you'll have to composite the two and set the blend to make it appear as though the camera dips below the surface of the water.
Stay tuned.
Dave Baer
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida
dbaer@dmac.edu