Here is some info on them and photos of them in action.

Gannets hunt fish by diving from a height into the sea and pursuing their prey underwater.

Gannets have a number of adaptations which enable them to do this:


they have no external nostrils;
 they have air sacs in their face and chest under their skin which act like bubble wrapping, cushioning the impact with the water;
 their eyes are positioned far enough forward on their face to give them binocular vision, allowing them to judge distances accurately.



Gannets can dive from a height of 30 m, achieving speeds of 100 km/h as they strike the water, enabling them to catch fish much deeper than most airborne birds down to almost 40'.

They actually beat their wings underwater allowing them an additional reach in depth.



When they hunt and dive as pictured, this is called a "blitz" and what fisherman look for to find the larger fish who are pushing the bait fish to the surface.