D'oh...
I'll need to find a way to fade it to black so that there really is no distinct line between the water and the sky.
The model of the sub itself is extremely crude. It a 5-minute modeling job. Just well enough to serve its purpose, hehe. Certainly not worth posting a wire and taking up more space on the server.
Thanks, I'll get on it.
Signatures are the opium of the masses.