Ocean Surface from below

I am working on an underwater scene with cycles, and am trying to figure out how to get the lighting right to show the surface of the water from beneath. What I am looking for is something similar to the first shot of this video

you can get the shafts of light effect by using a spot lamp set to ‘halo’

Thanks, what I am looking for specifically is how to make the rippling water on the surface.

there’s a recent addition to the modifiers panel: " ocean ". should be just what you are looking for.

I already have that set up, the problem I am having is getting the lighting and refraction to look realistic.

I think it’s because there isn’t anything for it to reflect or refract above the water. what about putting a sky dome in, maybe with an emit value?