I found some great video from the BBC this morning on the BBC News website. They are from the latest episode in the Natures Greatest Events series - The Great Tide.
I can't figure out how to embed the videos so here are the links. This one shows Cape Gannets plunge diving into sardine balls from above and below the surface. Amazing stuff.
This video also includes footage of dolphins, sharks, and gannets foraging on sardines, again from above and below the surface of the water.
Here is a link to the series home page for more great stuff.