The BBC website has some video of a 4 metre high wave near Pohnpei in Micronesia. They filmed it with a high definition camera in super slow motion. As a result it shows the first images of underwater spiralling vortices created by the wave action.
The area is well known in the surfing community, and the waves that the surfers come for have travelled more than 5,000km, which helps explain their size and power.
The video is well worth seeing aand is on the BBC website.