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See the mouth was actually open, all the shark's eyes were actually open when it was right above the water flying through the air. it's also interesting within a split second how the sharks are able to reject the decoy. they know almost the moment it touches their teeth that it is not the real food item and will spit out the decoy with a tremendous whoosh of water. >> wow. >> those are the type of games you don't really think you want to play with a great white shark. >> an amazing look at a great white. the clip part of the discovery channel's shark week program. that was not a real seal, it ...

Polynesian cultures revered shark gods. "jaws" built a fear what have might be below us and that plays a large part into our fear. it is not the sharks per se but the fact there is an animal there that's been known to attack people in the past and it lives in a world that we can't often see or aren't very coordinated in. >> let me come back to this idea whether humans are actually a source of food for a shark like a great white. obviously we're not their normal prey because we only play in the ocean, we don't live in it. but if we go back to the striking video from the discovery channel of the...

-- shark week has really become a phenomenon. people love to watch that stuff. it's one of our primal fears. what's new this year is you have some technology that makes it possible to get so close to the shark and see them like we've never seen them before. >> this is our 23rd year. every year, we have to do something new. this year, we're taking the technology route. we have a super slow mo camera, we're going to south africa and looking at breaching behavior. we're able to take a one second attack and break it down. >> that is a great shark attacking a seal decoy and they're hitting the wate...

My mate gets hit than i get hit and the grouping goes back to understanding how humans grouped an formed societies in the past. bill: survival, huh? >> survival. bill: that is interesting. martha: and they band together, but if you are on the last guy on the outside of the group you are in trouble. >> that is what we have found. and you see in the documentary, the incredible seal decoy, we had 6 or 7 and some of themary concentrated in and, the isolated ones were more vulnerable to getting attacked than -- >> what did you find out. >> they are pretty intuitive and we have the data to proof you...