three of them. >> oh, god. oh, no! >> from the depths of the ocean, some of nature's most vicious predators on the attack. >> i just thought that the fish stabbed him in the face, and i was like, oh, my god, my brother's dead. oh, my god. oh, my god. >> rare and terrifying encounters under the sea. >> this great white grabbed me. >> nowhere to run. >> i mean you've got a couple tons of whale tail coming at you that fast and its barnacle alone would have been like getting hit with baseball bat the size of a tree. >> nowhere to hide. >> shark snapped the whole front of the cage off, came right inside with us. >> surfers, day trippers, and professional divers, make no mistake, this is their turf. >> there's always a danger when you are out with wild animals. anything can happen at any moment.