When sharks attack: What you need to know to protect yourself

This summer, shark activity at beaches in the U.S., was a little too close for comfort, with several people attacked while in the water.
7:48 | 08/29/18

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Transcript for When sharks attack: What you need to know to protect yourself
Reporter: For abor day weekend isynonymousith that last S beach getaway. But you want to think twice before you get into the water. This summer shark activityat America' beaches was a too closrom, mom!eporter: In some C came food, and left with th Esh. Sharks,atest are, you're looking at it. S attacks on two separate hes -- Reporter: Last month a 13-yold boy Ana 12ear-old girl bit no one waters offwo separate beaches in the nor area. It was like one second INT like tht just letimmediately. Right there! Reporter: This Sigg thest of Orange county. Holyep ]! Reporter: Aing cross the entry, in ce cod, a -year-oldan spent nearly two week the hospil after a shark left puncturends on his torso and leg. Call itlongnook a subject pos bitten by a shark in the thigh -- Reporter: William Litten told the sociated press he was swimming in eight to teet of water when he wack. Two nursing students on the cape provided ca got closer we realized he hadeen attacked by a shark, needed immediate medical care. We grabbed the towels, tried to SP the bleeding -- six surgeries later littton rehab clinic where he faces weeks of treatment and I stillrching for farmcy. There's been quite a bit of sharvity around the Ast this summer. Reporteick Whitney, shark Recher, says sharks have been closer to shore in recent years inch O food. White sharks gain protection of a lot ofsealsn the area and then more sharksoming in T on seals. Rorter: So far this year there have been 37unpred shark attacksworldwide, 21 in the United States alone. We aren't in the clear yet. In places like Florida, researchers say S attacksly O often in September. Wehink that probably the reason there's a P in September is because florida, in September is we get some te tempestuous WER -- Reporter: Last month Dustin gh bodilyattled shark attack on,flldays, Friday the 1h. Definitely weird being rig ck at thett had. Reporter: Dustin and 8-year-o son Emerson were at beach inflorid I wasro20 yards. Reporter: He says while his son Suri two feet of ter, it happened. Felt something grab O my foot. Turned around and sun hit him right above his own eyes Reporter: His son made it to E. I was like really confused. He was like, like swinging M -- Reporter: Behind other swimmers about theshark,ccording to witnesses, N before anotherperson was attacked. Theshark,e could have held on, could have keptgoing, he could kept jerking, foot ife wanted to. But he letgo. 1990s a wholeange of shark species have been protect by the federal government. Researchers say it's a fake for responsible for D animalopulation. But it's notorswimmers In general the shark populaons are D a lot better on the E coast of the United States than they were, for example, 20 years ago. Reporter: Reseahroject led by world-renowned shark ex dr.g schomos under way in cape cod. In 20 he invited colleague, David Wright, to cape cod on a shark-tagging of his own. This is the tag right there. All right? We'llull that magnet off I on,hat will ping away for 10 years. Reporter: Those pings detected by audio buoys positioned along the shore signaling th a shark is swimming by. See, that's a couple of little guys -- he and fellow researchers check the regularly. Now they're in the final of their five-year research project up overhead -- We're atigh altite now -- Reporter: A plane casts a bireye view and sees a shk prime F tagging. A go pro attached ole gives us an up-clo V of the shark. We're fingerprinting it. Oh, oh -- oh, wow..s get the tagging pole. Ar come up, hold on. Ee him now. 'M ready. Tag, tag, tag!yeah, yeah, yeah. T's pretty good W shark, you don't see that every day. Reporter: Asc as these animals E, they still po big threat. An there are some people like Nola buff and Mike dornel THA thrive underwat stu like Thi O the regular. They say don'tlame the ar Most of it is human error. It's our lacking getting in the water and an environment that coortable with. That's their home. Reporter: And I myself here in the open ocean off Ast of L.A. On theoorstep their home. And guys are dishing tips how to avoiddly encounters. I get the sen guys get lite bit of an adrenalih being out there in the water? I've never felt morend more relaxed than surrounded by a bunchf sharks, believe it or not. Tiger, tiger, turn around! Repr: The duo was P of discovery's "Shark week." You can avoid almost E bad incident THA happens wh sharks. Reporter: "Thes of jaws," unlog CL the keys to survival re-en harrowinreal-life incident It's gotbe difficult, maybe eve a learnedll to B able to actually face a srk in the eye you're in these close , flight. Yeah. St people uld want to away. Sharks because it's goingo show T predator versus prey. Orter: Theeam has a for .mplymacking the water help prevent an Atta they say depending on theoves you make in the you can eithdistract or attract the shark. What's the difference B this kind of noise dead imal would make, and this more intense splashing la we're talking An animal that' suffering, if it's a fish and it's twitchin certain I tnk ks might be attracted to that. Can pick up on that energy or pulser whatever sound it is that they do make. Theyl come investigate. Repr: Guys convince me to dive in and learn the techniques that could prevent a Fata WHA I'm going to be doing is aepetitive so paddng. R: Those little rhythmic splashere theounds that attract sharks. Instead they say to scare the shaway, a loud slap in the water iste G to do.much force should young when Y slap down? Give it all you've got. Wantoatch that of air in your hand. If you're coming down, give it everythi yave. Shock. Reporter:k Florida, Dustin's C encounter with a shtim out of the water. An imagine not having the B in my life. Reporter: Fornightline,

This transcript has been automatically generated and may not be 100% accurate.

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