Watching the Gannets circling over the ocean in the late afternoon was a treat. With a lightning-bolt nose-dive they'd spear down into the ocean and that part was impossible to capture! From where I stood you would see a long white streak underwater where they'd pushed through the surface.
According to Birds in Backyards these birds soar 10m or more above the surface of the water, herding fish into shoals, then fold their wings back and dive into the water to catch their prey. The fish is normally swallowed before the bird reaches the surface.'
re-surfacing after a catch