Selfportraits. Taking matters into his own hands to make it stop. But first the nightline 5. Hurry in for the jcpenney fourth of july sale, 4. 99 arizona tees for the fa tlm reserve family. Swim wear wear for him and her. Get 10 off a 25 purchase with coupon. Thats getting your pennys worth. Tired of redosing antacids . Try duo fusion. New two in one heartburn relief. The antacid goes to work in seconds and the acid reducer lasts up to 12 hours in one good evening and thank you for joining us. Im rebecca jarvis. The big question, how could those three suicide bombers pull off such a complex attack at one of the worlds busiest airports . New images of the men believed to be behind the carnage and the panic they caused. The somber warning tonight for the Holiday Weekend ahead here. Abcs terry moran reports from inside ataturk airport in istanbul. Reporter tonight, new details emerging in the terror attack at the airport in istanbul that left 42 dead and 238 injured. For the first time we see the face of one of the suspected attackers. The man in the baseball cap wearing a winter jacket on a summer day. Just before 10 00 p. M. , officials say, he and two accomplices pulled up in a taxi to istanbuls ataturk airport. The attackers got out of a taxi at the front of the airport where the first layer of security is. They were spotted and scattered. One heading down that way opening fire, detonating his explosive. Another making it into the terminal there. You can see the busted windows. The third going downstairs where people were waiting for rides and detonating there. Unleashing a combination of deadly fire inside the airport. Thats when i saw him in the corner. I saw the bullets flying. Reporter terminal surveillance camera captured this image of the man believed to be one of the gunmen. Some people cowering in terror. Others running for cover. Then an explosion. First we heard the ground fire. After we heard the screamings. Everybody starts running. Reporter this Airport Security video appears to show the lower level of the International Terminal as another one of the bombs goes off. People were shooting on one side. We all ran the other way. Then the bombs went off. Reporter one of the attackers detonated right here. And this area is the arrivals hall where people were waiting for their loved ones. In the confusion, acts of bravery. This video shows the seconds before an extraordinary takedown. As families flee, a gunman rounds the corner chasing them. But hes shot by a Police Officer and collapses. His gun sliding across the floor. The officer approaches but runs for cover as the terrorist writhes on the ground fumbling to detonate his suicide vest. The turkish Police Officer who took down one of the terrorists as you could see in that Security Camera video, tonight he is in the hospital, he was shot during the takedown. He says he didnt feel any of the bullets hit him. That was quick, decisive action. Youre dealing with people that dont care if they live or die. Reporter some improvised to help the injured, using luggage carts as gurneys. A very bad ending. One guy had holes in his back from shots from glass. Reporter steven, freelance journalist working for abc news, describes the ensuing panic. Passengers ran down corridors and he desperately tried to find his wife. I saw the sea of people flooding toward me. I was just pushing through them, trying to get through to her. I was praying to god that she didnt leave the area as long as i could find her, at least i could take her to safety. Reporter outside the airport the terror wasnt over. A third attacker was waiting. Detonating his suicide vest near a line of taxis as some people ran towards what they thought was safety. You can see the force of the blast. Bodies on the ground. Peoples Natural Inclination is to go outside. You dead nate the bomb outside and whats on the outside of an airport . Glass. With an explosive like that, thats going to inflict mass casualties. Reporter hundreds of injured rushed to the hospital. The attacks sending shock waves throughout the world. In canada, president obama vowing to strength. The fight against terrorists. Theyre going to be defeated in syria, theyre going to be defeated in iraq, theyre going to be on the run wherever they hide. Reporter no terrorist group has claimed responsibility for the attacks but the turkish Prime Minister and u. S. Officials say it reeks of isis. Despicable attack at istanbuls International Airport yesterday certainly bear the hallmarks of isils depravity. Reporter cia director brennan warning, as he has before, the main goal of isis is to successfully attack in the united states. If anybody here believes that the u. S. Homeland is hermetically sealed and that the daesh or isil would not consider that, i think i would guard against that. Reporter in america, heightened and visible security at airports. No more tears. Reporter passengers who left turkey before the attack, some learning in the air watching tv, were shaken arriving here. I couldnt believe it. We were just there a few hours ago. Im shaking. But im relieved. Thanking god that i was in the air and that he was watching over me and that i was fine. Reporter at jfk airport in new york this morning one terminal was evacuated after an unattended bag was found. If travelers are on edge, they have reason. There have been nearly 60 attacks at airports in the past year. Most recently the horrific attacks in belgium three months ago. Where three terrorists set off twin blasts at the airport in brussels. The attacks killing 32 people and injuring hundreds. You look at what occurred in brussels at the airport, which is almost simultaneously across the board, and you look at this. Its much more methodical in the way they planned it. Reporter experts say the airport in turkey has tight security in the departures area of the International Terminal. Passengers having to go through security checkpoint before they enter the building with visible Armed Security officers. What i found interesting about the attack yesterday was the fact that it was in the arrival area, which is a little bit less secure and not as strict as the departure area, which makes me think they did recons sans and understood that, or had help from inside understanding vulnerable areas of the airport. Reporter Security Experts say the front of airports are soft targets for terrorists designed with participatings ease and comfort in mind, rather than safety. But they say there are ways to improve security. Highly visible, armed officers in the front of the airport does alabama act as deterrent. Reporter reinforce the physical structure. Put more steel, reinforced concrete in that front area of the airport. Put things like mylar on the glass. Reporter use innovative technologies. And three, pass legislation or regulatory action. Airports arent going to do this because it costs a lot of money. Unless theyre told to do it, theyre not going to do it no matter how much security sense it makes. Reporter now that Summer Travel season is under way, today the state department is recommending travelers use situational awareness. Were simply reminding americans as if they need reminding, be up to date on the current information to bring street smarts. Reporter in istanbul is airport is open but evidence of the horror remains. Workers wiping off traces of blood from the walls. Vendors opening up shops by shattered glass. Some of the other damage hidden by temporary walls. With isis calling for attacks during ramadan and an american holiday coming up, everyone agrees the attack in turkey wont be the last. For nightline im terry moran in istanbul. Thanks to terry moran. Much more on gma in the morning. Next, going deep. For a new look at an ancient predator. And say cheesey. Why this fedup dad is going on a selfie spree. And say cheesey. Why this fedup dad is going on a selfie spree. And that was amazing. Along with support, Chantix Varenicline is proven to help people quit smoking. It absolutely reduced my urge to smoke. Some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. Some had seizures while taking chantix. If you have any of these, stop chantix and call your doctor right away. Tell your doctor about any history of Mental Health problems, which could get worse or of seizures. Dont take chantix if youve had a serious allergic or skin reaction to it. If you have these, stop chantix and call your doctor right away as some can be lifethreatening. Tell your doctor if you have heart or blood vessel problems, or develop new or worse symptoms. Get medical help right away if you have symptoms of a heart attack or stroke. Decrease alcohol use while taking chantix. Use caution when driving or operating machinery. Most common sideaffect is nausea. I cant believe i did it. I quit smoking. Ask your doctor if chantix is right for you. Is happening now at red lobster. Summerfest and if you love lobster and shrimp,. Check out all these new entrees. Like new coastal lobster and shrimp. With summer ale barbeque sauce,. And new lobster and shrimp overboard. Overboard . Nah,. Its just right. So hurry in. Geico motorcycle, great rates for great rides. Yourbut the omega3s in fish oil differ from megared krill oil. Unlike fish oil, megared is easily absorbed by your body. Megared. The difference is easy to absorb. And now a new view of an often violent ocean predator. The shark. Until now it was nearly impossible to get a clear picture of their nocturnal hunting patterns. Tonight were taking you deep into sharkinfested waters to see these mysterious and mythical creatures like never before. Jesse palmer is taking the plunge. Nows kind of the moment where nerves, theyre kind of picking up. Reporter its dusk off the coast of the bahamas and were headed out further into the deep. Preparing for a dive in the sharkinfested waters in complete darkness. Its getting harder to see down under. Ill be honest, im having second thoughts. Youre going to see a lot of sharks. The lights dont really shoot out that far. So were really only going to see them when theyre right on top of us. Reporter for a chance to see one of the oceans deadly predators as few have ever seen them before, its worth the risk. Oh my god. Reporter scientists have tried for years to research and record the nocturnal hunting patterns of these sharks. Unbelievable reporter their findings, previously limited to gainey night vision footage. Now revolutionary advances in lowlight cameras are allowing them to clearly see the sharks, even under cover of darkness, for the first time. You look through the view finder, it looks like the middle of the day. Reporter making it possible to closely study their nighttime hunting habits and capture jawdropping shots like this. Whoa reporter a great white off the coast of south africa breaching in the moonlight for a discovery shark week special air jaws, night stalker. I think these new cameras are going to allow us to see into the nighttime world of the great white shark like never before. Reporter before i can dive to see the secret world of sharks i have to get my feet wet during the daytime to prepare. Were going to get up close and personal with sharks. Im ready to go. I get a crash course in diving. Whats up, man . Reporter meet with my guide, andy casa grande, renowned underwater cinematographer who studies shark behavior. Ive been diving with sharks 15 years now all over the world. Filming at night can be a challenge because you cant see them until they come into range of your lights. Once they disappear from the lights its basically anyones guess where they went. The last thing you want is a shark to sneak up on you in the dark. It gets a little sketchy, i wont lie. The number one rule i live by is to not act like prey. If you act like prey, the sharks treat you like prey. How do you act like prey . I dont want to do that. Frantically pan and i can swim away. Sharks get a bad rap but for the most part theyre polite predators, really chill. Polite predators . Yeah. They could kill us politely . But its pretty unlikely. Worstcase scenario is we could die. Bestcase scenario is having a good time, learning about sharks. Reporter im hoping for the bestcase scenario. The reef sharks are in full force. Are you ready to do this, buddy . Reporter we jump in with nothing but our scuba gear and wet suits. No cables. Its Pretty Amazing down here oh my god, did you see that . Crazy. Theyre literally everywhere. Thats way into my personal space. I got to be honest, i thought i was going to be completely freaked out here amidst all these sharks. Theres something very calm. During a night dive it might be different. Reporter when it comes to hunting in dark seas sharks have a biological advantage. Their heightened senses include powerful night vision. Reflective cells behind the retina allow sharks to see ten times better than human in the dark. Also crucial, their sensitivity to vibrations in the the water. Allowing them to feel what they cant see. For sharks to be able to hunt in essentially total darkness, their prey has to be hypervigilant, hyperagile. So whatever theyre hunting almost have no chance. Reporter these abilities make tracing their nighttime hunting patterns particularly important for researchers. Lets rtry this area. Reporter using sonar to track their movement as the sharks stalk seals. Look at that. Reporter this adeptness is also what makes diving with them in pitchblack waters so daunting. When the scientists in south africa follow the great whites into the deep, they have a cage to protect them. Coming in hot. Whoa, chris, you okay . The shark tried to get in the came with you. Reporter once again, were going in without one. They are more prone to being a bit more feisty and competitive at nighttime. Youre a big dude, youre fine, you can just punch one. Yeah, theyre only 12 feet, its fine. Youll see how good their vision and is their senses. They can clue in on anything. Even in total darkness. I think its going to be pretty epic. Reporter its go time. Seemed like a good idea three weeks ago, three hours ago. Im wondering, what am i doing right now . Run, run, run its freezing. Its like youre in the abyss. You cant see anything. You cant hear anything. Oh, boy. This ones a big one. Its a really, really big oh, geez. Oh, my god. Whoohoo as you can see, or not see, you look at them in the darkness, a shark could be right in front of us. Until it swims within our light range, we dont see it at all. Its coming right for me again. Crazy. Hes literally right beside you one second, then the next second, disappears completely into the darkness. I have zero idea where this shark is. Here it comes. Oh, wow. This things really getting up close and personal. Pretty much finding different angles so they can surprise their prey. Such an advantage, their ability to see, to smell. The electromagnetic feel fields. All the different tools is why this is the perfect killer. Were still alive, best news. I think i have all my fingers. Secondbest news. It was just so eerie down there. You have some of the worlds greatest predators literally circling you without any concept of where they are. Thats sort of their realm, their world. Sharks love to use that element of ambush. And we sdifd. That was awesome, something im never going to forget. An epic experience with some of natures most powerful hunters lurking in the departments just out of sight. For nightline, im jesse palmer in the bahamas. You can see shark week all week on discovery. Up next, the dad with the unconventional approach to try to change his teenage daughters behavior. Im billy, and i quit smoking with chantix. I had a lot of doubts going in. I was a smoker. Hands down, it was, thats who i was. After one week of chantix, i knew i could quit. Along with support, Chantix Varenicline is proven to help people quit smoking. Chantix definitely helped reduce my urge to smoke. Some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. Some had seizures while taking chantix. If you have any of these, stop chantix and call your doctor right away. Tell your doctor about any history of Mental Health problems, which could get worse or of seizures. Dont take chantix if youve had a serious allergic or skin reaction to it. If you have these, stop chantix and call your doctor right away as some can be lifethreatening. Tell your doctor if you have heart or blood vessel problems, or develop new or worse symptoms. Get medical help right away if you have symptoms of a heart attack or stroke. Decrease alcohol use while taking chantix. Use caution when driving or operating machinery. Most common sideaffect is nausea. Life as a nonsmoker is a whole lot of fun. Ask your doctor if chantix is right for you. Try cool mint zantac. Hey, need fast heartburn relief . It releases a cooling sensation in your mouth and throat. Zantac works in as little as 30 minutes. Nexium can take 24 hours. Try cool mint zantac. No pill relieves heartburn faster. Its tfrom the old way off buying and selling cars. Introducing beepi, the radical new way to buy sell cars, all online. Carefully inspected, guaranteed and delivered right to you. If you never have to step foot on a dealership lot again, neither should they. Beepi. Com zero to happy. The dad whos had it with his teenage daughter striking a pose. The ingenious and now viral way he came up with to make her stop the selfies. You know the old saying, if you cant beat em, join em. Well, thats what this spokane, washington, dad thought would be worth a try. When Christopher Burr martin thought his 19yearold daughter was posting too many selfies he knew she wouldnt listen to traditional parental nagging. Instead martin dubbed selfie dad began imitating her. I was like, tone it down a little bit. She didnt. So i said, ill show you what it looks like then. And show her he did. The hilarious visuals have gone viral, giving parents, teens and even martins daughter, cassie, something to laugh about. A lot of parents can relate to it. Because their teenage daughters, teenage sons, theyll take selfies all the time. They say a picture is worth a thousand words. But these selfies are priceless. Theres been so many people posting, oh, father of the year. Like, this is hill hair yus. Like, dad goals. As for selfie dad, hes just glad his joke on his daughter is making others smile. Theres just so many bad things going on, its just something dumb to laugh at, you know . Take you away from it. So if i can make somebody laugh in japan or australia or whatever, thats great. You certainly had us laughing. Thank you for watching abc news. Tune into Good Morning America tomorrow. As always, we are online at abcnews. Com and on our Nightline Facebook page. Good night, america