>> what would he did? >> he would hunker down like a submarine to the water and most of his head would be covered and as you see, piers, he has this incredible camouflage that allows him to melt into the watery world and in fact, he even has his own version of like a snorkel. if i close his eyes and if you zoom in tight to the eye. watch as we open it up. you can see that lens come across. >> wow, yeah. >> it's called a membrane to protect his eyes. when he comes in, he uses powerful jaws to grab onto the pray. it could be a turtle, large mouth bass. >> the bull shark -- >> he'll grab on and shake and tear. >> what will this do? >> hold on very, very tight. he'll take it and pull it down to a watery grave and once the animal expired they rip it apart.