Jcpenney, where giving begins. Good evening. Tonight we are going on a journey deep underground at the u. S. mexico border into the tangle of tunnels used to highlevel drug kingpins themselves. Nearly 200 of these tunnels have been discovered and abcs matt gutman takes us for an upchose look. Repororr in that beige garara is a multimilliondollar hole in the ground. And re about to stuff ourselves into it. My god, is it dark and chaus tro phone nick here. This is terrifying. We are the only News Team Ever to go down that hole. Thats a spike my head nearly went through. Reporter crabwalking our way down a former drug smuggling tunnel between the u. S. And mexico, one of the ways that tensns of billions of dollars of drugs are trafficked into the u. S. Every year. U. S. And mexican authorities have found and destroyed over 180 tunnels along this border. The question they say isnt whether there are more tunnels, but how many and where. Much of what whats funneled mexicos sin cineloaa cartel. Thth leader busted out of prison earlier r is year but having h come raids tunnel right into his prison cell. A tunnel fitted out with a motorcycle on a rail. Notorious not only for his narrow escapes and prison breaks but for the elaborate crossborder tunnels his cartel has engineered. Some like this tunnel discoverered near san diego, thousands of feet long. The job of finding them goes to the human moles, the customs and Border Protection tunnel am. You g gs took the training . R rorter tasked withh the somememes deadly job of sniffing out the tunnels honeycombing the 2,000 mile long borr with mexico. Whats crazy is that theres a tunnel right here and then theres a tunnel 20 feet behind. Three tunnels within the space of a year in 15 feet. Correct. Reporter out of the 180some tunnels found along the border in the city of nogales. Dodons within a football field d of where were standing. Concealing methods are creative. Its creativity. Its that simple. Reporter those engineers also use the massive drainage system between the two sides of the border. Right here is the tunnelling attempt. They chipped this wall out and crawled through here with the bundles and followed the wall around the bend, through the double gates, then they came out in the pipe north of the north gate. Reporter detecting them isis nearly impo upon. The one here in arizona, a Retirement Community carved neatly into the floor of a garage along this quiet street. Looking at this house, would you ever think that theres a highly sophisticated tunnel right through there . You could drive by it a million times and not have any clue. Reporter topping off this ruse is this engineering gem. A trap door operated hydraulically from 1,000 feet away in mexico. Its perfectly camouflaged with the garage floor. Before we duckk in, the one the rule is not to touch anything. Because its caving in behind you and theres no way back out. Reporter once inside, the air is in short supply. So they have to pump it in. And what little air there is feels syrupy. Cockroaches . We have cockroaches too. Reporter it only has to be comfortable enough to do one thing, smuggle drugs fast. Those sacks, thats got to weigh 50 to 100 pounds, eve one of those things. Theyeyaul them all the way back through . Correct, t ty drag them all wait back. Reporter dirt goes out and drugs go in. If you do a 4,000pound wad of marijuana that pays for the tunnel . Pays for the tunnel easily. Reporter dug by hand by day laborers, working with simple tools, for almost no money. No one knows how many tunnel diggers have died down here are. When diggers survive they often thank the tunnel gods. Wow, thats interesting. A lot of the tunnels they tunnels. They vary. Sometimes theyre just stuck in the mud. Reporter in our hour inside the tunnel theres some fear it could cave in. You can see the plywood creeling on here is all just rotted away. It caved in. Right now just walk right here. Walk gently through here. You dont want to touch the walls or anything. Reporter we see artifacts and what passes for entertainment. Finally we reach the end. At the end wed be under the fence. Reporter theheunnel had been filled in on the mexican side we hoped to see it but were told the Mexican Government was too busy toee us. You made a mistake and the Attorney Generals Office couldnt give us permission outside of the house. No one from the institution could go with you form. Reporter turns out youre agents were in hot pursuit of el chapo and wed have to fend for yourselves. That morning we e t a call. Heyre willing to helel us out. The officer of one of the prosecuts there is going to meet us. Okay. Reporter our convoy rolls up to a gated house. Its blocked. And someone scampers off to find a key which in this case turns out to be bolt cutters. Inside the house is a mess. A labyrinth of sodden clothes and leftover food. Still the hot sauce on the tablbl the tortillas as well. Maybe whats most amazing about this tunnel is a family used to live in that house. There are childrens toys and clothes. And yet in the backyard here, there was a massive piece of construction going on. That hole goes down about 25 feet. Its lined with concrete and cinderblocks. In order to dig that tunnel, 900 feet that inn that direction they had to remove hundreds of tons of dirt. Yet the n nghbors say they saw nothing and heard nothing. I asked the mexican officer with us who built it . El chapo . Reporter he said he doesnt know. It was abandoned when they got there. Right at the end of this street, just four blocks that way, is the u. S. mexico border. That right there is the border fence which means thatt that tunnel was dug right underneath the noses of body u. S. And mexican authorities. Following the line of the tunnel above ground, supervisory Border Patrol agent tom pittman admits thats probably true. Customs and Border Protection has robots they insert in the tunnels. This is one of those robots view inside Drainage Pipe used to smuggle drugs. Because of the tools and debriss so often left in t tse tunnelsls the robobs often snag and get stuck. They tell us theres no technological solution on the horizon either. What they knoo is that when they find a tunnel they know ty have an exit point and theres only one way to find out its entry. So basically the technology that exists today is the same that existed 50 years ago when dealing with these tunnels . One of us that can fit will go in there without anything on, just a pistol and flashlight. Reporter and hope he doesnt find someone elsls in there. Forr nightline, i i matt gutman in nago, mexico. And up next here, how Julia Roberts got the starring role in secret in their eyes, a role originally meant for a man. Also how she made our Michael Strahan blush. I like it welcome to the most social car weve ever designed. 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The latest l lding a role written for a man. Abcs Michael Strahan spoke to Julia Roberts abou her new movie and what makes her happy. I dont have the stomach to watch him walk away again. Reporter from americas sweetheart to a meertsd seeking revenge in the new thriller secret in their eyes. I found martin. Reporter Julia Roberts plays an fbi agent investigating her own daughters death. Its carolyn. What . Its its carolyn. Its your daughter. Repter it was an intense role help me reporter roberts had spousal support onset. Danny moder, the films cinematographer and her husband of 13 years. Did it help to have him there whenever you got out of a heavy scene . It helped if a couple of ways. Because first of all, i try to impress himo much that really, as much as i t t to impress my director really . I think, is he . Okay. Are you trying to impress your husband . Of course. Hes my person. I love that. Hes my person. In that regard i think i definitely tried to go more, find more, to kind of make him go, i did not expect her to do that. It became very meditative to go to Work Together or come homee togetherernd weve kind of gone through we come home, how was your day . Well, we did this, this. None of that. It was all about the kids. Which was amazing. Reporter over her nearly three decade long career, roberts has played it all. From a Law School Student in the pelican brief to a maid of honor trying to steal the groom in my best friends wedding. I dreamt some psychopath was trying to break the two of you up. Reporter she won a a oscar for playing a passionate activist erin brockovich. Not personal . That is my work my sweat, my time away from my kids if thats not personal i dont know what is reporter it was her role as a pretty woman that catapulted her career. Oh reporter 25 years later, i met up with robert in the same place where she shot pretty woman. The beverly y lshire holt. Hotel. Wow. Do you have any feelings that come over you when you come into this hotel . Abject awkwardness. Especially when i go into the elevator. Because the elevators are exactly the same and have the little seats. Color me happy theres a sofa in here for two first time in an elevator. Reporter thats when i just walk in and kind of look arou. Everyones looking at their feet. Because you make them neneous . Because we all feel uncomfortable. You dont make me feel uncomfortable. If we g in an elevator youd be so uncomfortable right now. Dont you ever, ever reporter in secret in their eyes roberts played a role originally written for a man. When they say, we want you to play this part. They dont want you to play it as a man. Ive had too play oprah so im curious. They made me play y rah as a woman. I do feel masculine, im a manly girl. It was one of those things they original and incorporated some issues, some situations from other characters, in the original, to put together to create the character that ultimately i do play. Reporter despite her superstardom roberts prefers to stay out of f e spopoight and off social medidi instead focusing her attention on her three children. As the father of four kids myself i was excited to ask her for parenting advice. My daughter said to me last year, talking about school, and she was having some frustration. And she said, mommy, you just dont know what its like. The next morning i said to her, guess what im going to do today . Im going to sit in the back of your classroom all day today and understand what its like. Wow. By the time the belll rang to go home, this is what i know. No child wants to get in the car and have their parent say, how was your day . So you were overwhelmed by it . I just i just wanted it to be over. All i can say is, it was a quiet car ride home . And thats okay. Thats okay. To not be talking i ithe car . Is fine. I like that advice. Reporter roberts said she leads a normal life. Cooking, helping her kids with homework, walking the dogs. She even let me in o one of h family traditions. Theres something i hear you play at the dinner table, the family dinner game. The family dinner game. You ask questions around the table. Can we play that . Do you have questions . I have a few questions. Whats your middle name . Anthony. What is the first thing you look at when you see somebody . I guess you know, your eyes, your smile. Probably your eyes. Theyre brbrn. Theyre twinkly. Im blushing. I didnt think i blushed. They are brown and twinkly. Brown and twinkly, okay, thank you. Thats when you say, oh, so are yours. Reporter looks aside, i asked her about her key to happiness. You have the natural chemistry of joy. What is the natural chemistry of joy . Just a roll of the dice, i think. I feel like i was born of joy. And i know that you share that same feeling. That just happy is something that i feel im blessed with o theres also that sweet adage, it doesnt matter if you win or lose until you lose. Oh. Im just kidding, thats not i kind of liked i i was mesmerized. Oh, boy y oh, that was pretty good. Thanes to Michael Strahan for that report. Up next on nightline, would you hit the slopes after surviving this why and how this guy managed to walk away unscathed. under loud music this is the place. Their beard salve is made from you, my friend, recognize when a trend has reached critical mass. Yes, when others cus on one thing, you see whats coming next. You see opportunity. Thats what a type e does. And so it begins. With e trades investing insights center, you can spot trends before they become trendy. E trade. Opportunity is everywhere. Yeah. Thats the one right . We forgot dave thank you. So, can the test drive be over now . Maybe head back to the dealership . Its practically yours, but we still need your signature. The sign then drive event. Zero due at signing, zero down, zero deposit, and zero first months payment on a new tiguan a professional skier gets back on the proverbial horse just two days after a heartstopping video. How did he pull it off . Heres abcs t. J. Holmes. Closely. Oh reporter thats professional skier Ian Macintosh plummeting 1,600 feet with theounds of every painful bump and grunt recorded on his way down. Oh it felt like an eternity. P it really did. To stop. Reporter macintosh was filming paradise waits when he mistakenly skis into a fivefoot trench and wipes out. Oh oh i had no ideaeahat was coming. I knew at that point it was game over. I was going tort ride of my life. Reporter thats the very moment you hear him cry out. Oh no it felt like i was getting hit by linebackers the whole way down the mountain. Over and over and over again. Reporter while macintosh was falling he was thinking. He made the decision to deploy the avalanche air bag that was built into his backpack. Pull that white handle for me right there. Theres your life jacket. For when youre flying down the mountain. Youre thinking all these` things while in a death spiral. To do what i do for a living you dont panic when things get nearly a minute, macintosh comes to a stop. Im okay reporter miraculously, macintosh was able to walk away unharmed and undeteteed. These air bags are designed to keep you on the surface so you wont get buried in an avalanche. I dont want to die doing what im doing. I dont have a death wish, im not the type. But i do have a wish to live life to its fullest and get out there and live my dreams. And this kind stuff is what i dream about, its what i lay awake thinking about. Reporter for nightline im t. J. Holmes in new york. Our thanks s t. J. Holms and our thanks to you. Tune into gma first thing in the morning and dont miss diane sawyer interview wi the star of the hunger games Jennifer Lawrence tomorrow. Were always online at abcnews. Com and on our