Transcript for Tips to Survive a Shark Attack
Back now at 7:41 with "Gma" survival week. Just this past weekend, a teenage surfer was badly bitten in south Florida. Saved by people on the beach. It's not just about luck. Matt Gutman tells us with an incredible demonstration to boot. Good morning. Reporter: Good morning. This time I had to jump into the deep end to fend off sharks, my hands and feet. We had a number of safety precautions, including chain mail armor. This is probably one of the most terrifying experiences I have ever had. Get out of the water! Shark! Reporter: This is the terrifying moment a great white attacked swimmer Steve Robles on a beach during an early morning swim. You could hear it crunch. I was staring at the shark eyeball to eyeball. Reporter: She jabbed the shark's nose and it let go. It was the most frightening anything anyone could experience. Reporter: There were 51 shark attacks on U.S. Coasts last year, but according to this survival expert, surviving a shark attack isn't as impossible as it may seem. To show us, he took us to an especially shark-ridden part of the Bahamas. Where the natural beauty belied what's beneath. First a quick scuba dive to get our bearings. There are sharks everywhere. Reporter: In a frenzy of reef sharks. Up to ten feet long. Less aggressive and less lethal than clay wanted. Wear right in the middle. Reporter: We're about to do what they tell you not to do. Float on the surface, most dangerous to humans. To the sharks, our flapping hands, legs and feet look like food. Everything smell like food, including you. Reporter: We are simulating a person dumped in shark-infested water. We have chain mail to protect us. Ready? Reporter: No. Let's go. Reporter: Gallantly, I let terry go first. I just landed on one. They are just bumping us right and left. And in the midst of this school of 25 sharks that my lesson begins. Whether it's great whites or reef sharks, he said the advice is the same. Get back to back, and link arms. Now we have each other for protection. We're on top of the water thrashing, that's potential food. Right. They come in, and it becomes an attack -- Reporter: Yep. Reporter: You're going to have to strike them. Quick, fast, punch down. Guarantee you're going to hit them somewhere around here. They don't like that. Reporter: The eyes, gills, nose, snout. Reporter: All the sensory information is here. All you can do is fight and let them know you're not going down easy. Reporter: Within minutes, they are over us. And it's a fight to keep them off. The best thing for me right now is finding them off with my feet. Kind of like that one. Yeah, do the best you can to keep them off of you. Reporter: But it doesn't always work. The sharks keep come. Watch this. One going right over my head. Get in. Reporter: And that was enough for me. That was? Yeah. Sorry, that was enough for you? That was enough for me. Sharks don't eat people. Most of the attacks we have seen are cases of mistaken identity. They mistake hands and feet. They don't have hands, they use their mouths to taste things. So, you know, what's remarkable about this is that they didn't bite us. We were in the water, gave us every opportunity to chomp on us, and they are smart enough to know -- laughter here -- smart enough to know the difference between fish and man. What are you doing? The entire endeavor was. I let him go first. I was terrified. You did it. I'm afraid what you're going to teach us to survive next. Plane crashes and boat crashes are next. We did not hurt the sharks. Just pushing them off. You volunteered for this assignment, right? I dp maybe the last one. You and ginger should do something together. A great team. I think so too. You win the insane anchor of the month. That was -- that was very impressive. Thank you. In that situation, I know what to do. I'll be thinking of you. All right, everybody.
This transcript has been automatically generated and may not be 100% accurate.