This is every surfer's worst nightmare. Good thing these two got out okay.

The incident was filmed in Puerto Rico, at Middles Beach in Isabela.

Jorge Benitez, the onlooker who filmed the video said it was the first shark he had ever seen.

Rolando Montes, one of the surfers in the water can be seen making a hurried push to shore, as the great white began to circle in.

Apparently shark sightings in Puerto Rico are rare, but not uncommon.

And according to statistics, you have a better chance of being attacked by a shark in Cape Cod Massachusets, than anywhere else in the world.