This is a special edition of nightline, inside the ring of fire. Good evening and thanks for joining us. Japans mt. Ontake is still erupting tonight, after a blast covered hikers in suffocating ash. An estimated 36 people died in the tragedy. So, why would anyone visit a volcano . On purpose . Tonight, were taking you on a journey few have braved before, to a Remote Island thats home to one of the most violent volcanos on the planet. Abcs Gloria Riviera is heading into a ring of fire with some intrepid experts to experience the deathdefying drama of earths 3,000degree oven. Reporter the sheer force of it is like nothing else on the planet. When youre this close, you not only hear that boom, but you feel it. What you see is stop in your tracks stunning. Were inside the ring oaf fire. The most explosive terrain on earth. Bearing witness to one of natures most violent and unpredictable forces. And at the center of it all, 11yearold molly ambrose. The worlds youngest volcano hunter. Came a long way and the only way to here is by boat. Reporter shes traveled end gleez with her father, rad. Can you hold onto my bag . Reporter who makes a living filming rare images of natures most explosive threat. I can smell something burning. Everything about a volcano is different. They have different personalities. Reporter and right now, theyre venturing to one of the angriest. To capture the ultimate shot of this violent volcano, located on an uninhabited island. What are the changers on a volcano . Lots of things could go wrong. When the lava shoots out of the crater, it could hit you and you can get burned or a rock, you can get hit in the head. The longer you sit around a dangerous place, something bad will happen. Reporter leading this indonesian odyssey, jeff mackley. A legend in the business. At the moment, im about as close as you can get to the volcano. Reporter and a lifelong adrenaline junky. Its like a drug. When you find something you like, you do it again and again even though it may cause you harm. I think thats how you describe that. Thats the goal, down there. Five meters. Reporter together, these new zealand natives have been to hell and back. Oh, my god. Oh, jesus. Reporter cashing in big with breathtaking footage like this. Just feet from a chaotic caldron of bubbling lava. What did it look like . Looks like the surface of the sun. It looks like all of my wildest dreams. Reporter its pictures like these that have made them famous. But new adventures beckon. The more remote and difficult the journey, the greater the prize. And we want in. So, we asked them to be our guides. But can they really pull it off with a child in tow . Every time you go out there and you get on a volcano, what are you hoping for . Im hoping to come back alive. Reporter so am i, because this journey will be treacherous. Indonesia is home to a record 147 active volcanos. And on our way, we pass through this hellscape. A volcanic sulfur mine engulfed with toxic gas. A large enough eruption could unleash a giant active lake on everyone below. Water so toxic it dissolves metal. It is risky, even for the adults who work here. And certainly not ideal for an 11yearold. What do you think of this place . Its cool. Really cool. Reporter this is an inherently dangerous and unpredictable place. Does molly have any place being there . I think so. Shes getting world experience that shes not going to get anywhere else. Theres only so much you can learn from looking at a tv screen or experiencing it on a computer. Reporter brad, a divorced dad, is almost always on the road. And if molly didnt come along, he says hed barely see her at all. Because i actually live four, five hours away from her, i want the time that we have together to be special. Reporter this volcanic mine is a first for molly, but jeffs been here before. Its been ten years since i was last here and things have changed a lot. Now the tourists outnumber the miners, probably 100 to 1. Reporter volcano tourism is the latest trend in adventure travel. And thats a problem for jeff, because no client is willing to pay to be dollar for pictures anyone can get. To stay at the top of his game, he has to up the ante. How far are you willing to go to get those shots . Oh, to the ends of the earth. Reporter and thats exactly where were headed. Its one of the most active volcanos on earth at the moment. But a place most people have never heard of. Reporter let alone seen. We take two planes hey reporter a long drive. And hook up with a local guide who helps us hitch a ride on a tuna fishing boat for the final leg. The only way to get out to this volcano is to take one of these boats, six hours at least, were told its going to be pretty bumpy. Disappear for a couple of days and go fishing. And hopefully they come back. Reporter this is the flores sea and we are surrounded by volcanos, stretching 25,000 miles around the pacific. This ring of fire is home to 90 of the worlds earthquakes and by far most volcanic eruptions. You have tsunamis, earthquakes, volcanos. Is the ring of fire the most volatile place on earth . Id call it necessary. If you didnt have the that stuff going on, the earth would be tearing itself apart. When you go to these places, if youve got something, you dont have it. If you need a hospital, there isnt one. If something goes wrong, youre screwed. Reporter our local guide says fewer than 50 westerners have ever braved the journey. Certainly none as young as molly. Maybe she should move with daddy. Reporter the trip is brutal. Six grueling hours on a dodgy boat, beating into oblivion. Only molly keeps smiling. The rest of us, queasy. Its erupting right now. Reporter oh, yeah, look. Oh, my god. Thats huge. Its almost like on cue. Just as we started to get close, it erupted. Almost as a welcome, or maybe a warning. Reporter one by one, we load up. High five. We made it. Reporter even this strange pae passenger. Our guides insist we bring him along as a sacrifice. An idea molly hates. Were now on sacred ground. Low cams have always steered clear for fear of upsetting the mountain. Thats it. Were alone. Were alone out here. When night falls, we goat work. And with only 48 hours on this island, every second counts. What do you have to do to get the shot . Well, you pretty much got to stay awake with a camera aimed at the action for as long as it takes to get the action. You dont know when thats going to come. Or if youre going to run out of batteries before you get the action. Largest eruption weve had so far happened reporter yeah. So, now im going to go and see how big it really was. Reporter the guys are able to film a few decent eruption, but not the shot theyre after. We have no way to predict just how violent each eruption will be. So, what is the safety plan there . There isnt one. Reporter there isnt one. Youre on an active volcano. The safest thing to do would be not to be there at all. Reporter the terrain here is unforgiving. The elements, extreme. And when brad and jeff are distracted, molly falls on jagged rocks, injuring her elbow. Molly was behind us while we were talking and she slipped on a rock. And it only happens, what, 20 centimeters behind me. Reporter yeah. She needed dad. And there was an oh [ bleep ] moment. Oh, gol oh, god. This is the first night. Reporter the night only gets worse when we attempt to sleep in our makeshift camp. Weve had a major rainstorm tonight. Weve had a few really, really big explosions. Were having huge problems right now because this tent is basically collapsing. At the same time, we realized that the sea is starting to invade our camp to the point that the waves are cashing so close, they are coming inland and hurting us. It was kind of like hell. Reporter were trapped between an erupting volcano and swelling seas. At this rate, im not even sure how well get off this island. Coming up, we face the full r h rath. Into one youll never forget. Earn points for every flight and every hotel. Expedia plus rewards. Feel like a knot. How can i ease this pain . man when i cant go, its like bricks piling up. I wish i could find some relief. announcer ask your doctor about linzess a oncedaily capsule for adults with ibs with constipation or chronic idiopathic constipation. Linzess is thought to help calm painsensing nerves and accelerate bowel movements. It helps you proactively manage your symptoms. Do not give linzess to children under 6, and it should not be given to children 6 to 17. It may harm them. Dont take linzess if you have a bowel blockage. Get immediate help if you develop unusual or severe stomach pain especially with bloody or black stools the most common side effect is diarrhea, sometimes severe. If its severe, stop taking linzess and call your doctor right away. Other side effects include gas, stomacharea pain and swelling. Bottom line, ask your doctor about linzess today. Insurance because it was too expensive. As a professional dancer, i tend to beat up my body a lot, and having Health Insurance is a priority for me. Its a relief to be able to keep the same doctor. I was born with a back condition that required surgery. Im paying a fraction of what i used to pay. Even with my back issues, im able to afford Health Insurance. Im in. Im in. Im in. For the first time ever. Over one Million People have enrolled in Health Insurance through covered california. Soon, you can join them. And were back tonight, inside an explosive volcano. Even the locals keep their distance. Were going right in. With rain pouring down from above and lava bubbling up from below, our quest is on to capture the staggering and deadly beauty few others will ever see. Here again, abcs Gloria Riviera. Reporter im in the heart of the pacific ring of fire with a trio of dangerloving volcano hunters. Look at that. Including 11yearold molly ambrose. These intrepid photographers in pursuit of the ultimate shot that have led me to a remote, uninhabited indonesian island. And one very angry volcano. We only have two nights here and we barely survived the first. Battling crashing waves and torrential rain. Come morning, the tide is threatening to overtake camp. Instead of filming, theyre scrambling to build a barrier. Its still quite sore. Reporter and molly, shes still a little shaken up. Sometimes i get a bit scared, but dad says, the good thing is, when youre scared, its because youre thinking about all the dangers. Reporter right about now, her dads mostly scared because thousands of dollars are on the line and he still hasnt captured the shot. They are racing against time. We pretty much lost half the day just waiting for the weather to start clear egg. Ideally, theres so many other positions we want to be in. Reporter getting any closer by boat is out of the question. The money shots doing something ridiculous on camera that doesnt get you killed. Reporter now the locals are saying, they think the mountain is pissed off with us, we didnt make any offering. Well, kill a chicken. Reporter kill a chicken . Remember this poor soul from the tuna boat . Well, desperate times so this chicken actually we would like to sacrifice. Reporter the guides hope now our luck will change. Call it coincidence, but after a few hours, the weather improves. We set out on an expedition to get even closer to the eruption. I mean, i cant believe how close we are. That is insane. The volcano, it seem, was expecting us. Very beautiful. But it can kill you. Reporter it can kill you. Yeah. Reporter but the real show happens after dark. So, we made it close. We didnt get the explosion we wanted. We have to move positions. Now were hiking at night, much harder, to try to get a better angle. Holy crap oh, my god. That is amazing. You can see all those rocks, those lava boulders coming down that chute. Sounds like thunder, fireworks, an airplane taking off, all at once. That is a fireworks display that only Mother Nature can do. The ones that you feel before you hear, those are the ones that you think, god, i hope, you know that theyre happy with us. Reporter as the night wears on, brads pursuit of the shot borders on obsession. I think ive got everything i need, but you always want one more. Done. Good time. Ive done it now. Reporter but was it worth the risk . Especially for molly . Youre talking about a place that is unpredictable. There are no guarantees. If things go wrong, they would go very wrong and youre taking your daughter to those places. I think the journey is almost more of a risk. Crossing a road, jumping in the car reporter i dont know people will buy that. To me, shes the most valuable thing in the world. I wouldnt want to put her in a place where im not comfortable being. She also balances me out. By having her with me, i dont push it as much as what i may have. Reporter brad and jeff court danger, but for half a billion People Living in the shadow of shes slum perring giants, volcanos are a constant threat. Its the ultimate lifegiver and lifetaker. Reporter right now, two major eruptions are threatening catastrophes. One in iceland. The other in the philippines, where 50,000 people are being forced to flee their homes. Volcano hunters are more than just thrill seekers. Guys like jeff and brad actually spend more time on volume kay knows than most scientists. And theyre indelible images are clues that help us piece together the mystery of these natural wonders. Potentially saving lives. After two hellish days on this island, im eager to leave. But not molly. Stay the night and watch the eruption. So, i wouldnt mind staying here another night. Reporter brads thirst for adventure must be hereditary. What do you want to be when you grow up . I just really want to follow dads footsteps. Reporter for this father and daughter team, a trip that took us all to our very limits, but brought them even closer together. The one constant we have is time and it keeps passing. Sooner or later, she wont need me anymore. I will always need you and i will always love you. Its good to spend time with him. Reporter even if it means it has to be on a volcano. Yeah. Reporter for nightline, im Gloria Riviera in indonesia. Our thanks to gloria and producer nick for that incredible report from the ring of fire. Next, is there anywhere the venn or the of the gopro hasnt gone with his famous gadget . Turns out, the answer is yes. And were taking you with us. In with his famous gadget . Turns out, the answer is yes. And were taking you with us. V with his famous gadget . Turns out, the answer is yes. And were taking you with us. En with his famous gadget . Turns out, the answer is yes. And were taking you with us. T e with his famous gadget . Turns out, the answer is yes. And were taking you with us. O gone with his famous gadget . Turns out, the answer is yes. And were taking you with us. R pandwer takg yo ocf iwith something terrible to admit. I treated thousands of patients, risked their lives, while high on prescription drugs. I was an addict. Im recovered now, but an estimated 500,000 medical professionals are still out there, abusing drugs or alcohol. Police, airline pilots, bus drivers. Theyre randomly tested for drugs and alcohol. But not us doctors. You can change that vote yes on proposition 46. Your lives are in our hands. And finally tonight, were taking you to new heights with a man who was named one of forbes youngest billionaires today. Thanks to a little invention he calls the gopro. A cool 4. 9 billion later, is there anywhere his celebrated camera hasnt been . Heres abcs world news tonight anchor david muir. The corner of faift avenue and west 33rd street here in new york. Where theyre waiting for us with their own cameras. The inventor of the gopro. Right there with a camera for me and a camera for him. And this is the first time hes tested out his cameras at the empire state building. Nick woodman came up with the idea. Just 26, hes a surfer. Attaching that camera to his surfboard. But his intentivention has the American Family in mind. Taking america to the top of the empire state building. To the observation deck, walking through that door and just look. You got to be kidding me. Look at this. Lower manhattan. If you look closely, right through those metal barriers, you can see it. The Freedom Tower standing high above the rest. But our next stop was even higher. Right up there, in the shadow of the spire. I got to hang out with you more often. You get to go to the cool spots. Right up to the 102nd floor. We go up one last set of stairs. This is exclusive access. All right. We climb the stairs, more than 1,250 feet up. The 103rd floor. And just look at the view tonight. Beautiful. Thanks for watching abc news. Tune into Good Morning America tomorrow. And as always, were online at abcnews. Com. Good night