Transcript for Diving with Tiger Sharks -- Without a Cage
Whether they thrill or terrify you, shark week, is reeling in a record-breaking 4 million viewers. But for some shark enthusiasts, the couch is not a close enough encounter. Some like "Good morning America's" ginger zee, dive in with no cage, no protective gear, to go nose-to-nose with the ocean's most feared predator. Reporter: They are one of nature's most-feared predators. And that is me, getting up close and personal. Holy cow. This is so gnarly. Reporter: It's really the only way to do discovery channel's shark week. Before we get to that adventure that finds me 25 feet down, surrounded by dozens of sharks, let's set the record straight. Sharks don't want to eat humans. They want fish. Still, reports of attacks are on the rise. Last year, there were 72 unprovoked attacks worldwide. Ten of them, fatal. 911, what is your emergency? I got a shark bite. Earlier this summer, a woman tubing with her friends in ft. Lauderdale, Florida, was bitten by a bull shark. Some of her wounds too gruesome to show. I get hit by something. Get out of the water. Reporter: And just last month, an eight-foot great white shark bit a swimmer off a California beach. I was staring at the shark, eyeball-to-eyeball. Reporter: Scientists say attacks are on the rise because more sharks are coming to the coast. And more humans are going in the water. And sometimes, sharks confuse humans with food. Why, oh, why, would I be jumping in? No stage, no chain mail suit. The reason, to learn firsthand, as scary as they look, we are much more dangerous to them than they are to us. For every one human killed by a shark, 20 million sharks are killed by humans. My adventure begins in old bahama bay. Here we are. The beautiful Bahamas. Discovery invited me to meet one of their shark week secret weapons. Stuart cope. A legend in the Bahamas for his intimate challenge of the beasts of the deep. They'll come up and taste before they bite. As long as you don't let them taste you, you're in good shape. They want to eat what they're supposed to eat, which is fish. And we had plenty of fish to get them interested. That would be a bunch of chum or fish guts in an icicle. Among the species we're going to see, tiger sharks. Ranking third in the world for unprovoked attacks on humans. And the tigers are the biggest. They're very large. Reporter: How long? They're three femeters, four meters long. Reporter: 25 miles offshore, our destination, tiger beach. 45 minutes later we arrive. And we're not alone. They're here, everybody. And so are we. And soon, I'd be in there with them. Those sharks on the surface are called lemon sharks. These are small compared to the tigers. They're still very large sharks. Reporter: I thought the small ones would be small. The tigers lurking below, are 9 to 18 feet long, weighing more than 3,000 pounds. He knows all about shark attacks and shark preservation. Not too long ago, my nephew got bit by a shark. There's been a rise in shark attacks in Hawaii. And my pursuit was to find out why. Reporter: Still, the odds of being attacked by a shark are only 1 in 11.5 million. But what are the odds of being attacked if you dive into a feeding frenzy of sharks because a cage, just wearing a wetsuit? To help the sharks distinguish between humans and food, we have to keep our flippers on. And our wetsuit zipped tight. Before I knew it, we were in that turquoise water. They're so close. Surrounded. It's pretty down here. I feel like I'm in a movie. So surreal. And the sharks, eerily curious, weren't coming after us. They're not interested in us. Reporter: They didn't mind as we petted them. Oh. And remember that chumcicle? Now, they're all over it. Setting off full-on chaos. Oh, my god. The shark has the camera in its mouth. It's so gnarly. Oh, my god. Reporter: The most amazing moment, watching the shark experts caress the tiger sharks, almost like a dog getting its belly rubbed. What's he doing to him? He's coming in for a cuddle. We're coming up. Reporter: Up and out of one of the most enlightening trips I have ever had. Oh, my god. Wow. Back on the boat, none of us could believe what we saw. Oh, my god. Gnarly. That was the heaviest thing I've ever seen. Heavier than my kids popping up. I'm telling you, man. That was crazy. Reporter: Even an old pro, like Stuart, was shocked. That was one of the best dives I've ever been on. Reporter: And despite what happened to others who have been attacked by sharks, most experiences with these animals are like mine, incredible and humbling. For "Nightline," I'm ginger zee, in the Bahamas.
This transcript has been automatically generated and may not be 100% accurate.