Fearless 'Solo' Climber Scales Daunting Peaks Without Ropes

Regarded as one of the world's best mountain climbers, Alex Honnold scales mountains without rope, safety gear or a helmet.
6:04 | 06/17/14

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Transcript for Fearless 'Solo' Climber Scales Daunting Peaks Without Ropes
Look closely that red specks stuck to the wall -- debt these Alex tunnels. No -- no -- equipment no turning back. It's hard not to be nervous even terrified looking straight down at him. He's an extreme three climbers this time taking on Mexico's -- -- You know so. The fact that tunnels life is suspended by just a few toes his fingertips and concentration. Galore. Is mind boggling. When you're selling your just sort of focus on what you're doing or you're the sort of empty and just executing -- -- yesterday. He's a pretty mellow guy for someone who -- putting his life on the line all the time. -- -- -- -- but yeah. What he's an incredible experience. It's -- quite hard work around got a brand -- Business and why. This fear danger and debt this subject everyone wants to know about drive huddled -- did not just. Because like all the -- wanted to do the crime -- a Rupert Everett. You know arena looks -- -- -- opinions of a cliff but lake -- a photo like that doesn't give any indication of how likely and a falloff. -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- But like. You know do people consider that extremely risky like now because. You know the risk is quite small received that would receiving analogy to. Trial programme on what the -- -- I think he did all of life is not you know like everything you do you -- risk. So you know the -- I choose my risks carefully becomes -- And he has had 28 humbled is easily regarded as perhaps the world's best mountain climber he holds a number of speed records for climbing -- faces in Yosemite. Without robes. But if you're going to see how he does it you have to visit his office and the mountains for herself. -- -- -- I did and can tell you climbing even -- little with Alex is definitely a case of it looks a lot easier than it really -- -- -- -- -- -- -- -- -- -- -- Yet he didn't believe that we tagged along with huddled and his good friend and fellow in obscenely talented climbers -- -- right into what. And what are we -- on a series of buying. Perfect. And you got me. Yeah. We. All right so well and why not a bad deal from one -- -- the year ago. -- is no sidekick he's an accomplished professional climber and his own right. But even he occasionally worries about Alex. He's in extremely accomplished athlete but at the same time that there's things that he can't account for public -- rocket break. Forum may be a bird flies at a cracker something he's playing in the game where they had -- had the the ultimate. You know steak is to lose your life huddled insists he gets too much attention for what's called free so -- going without ropes arguing that 90% of his climbs are with ropes but it's hard to argue with the impression people get watching a person -- -- -- to a mountain. Something that seems so -- possible to most of us once lived. And it's all over your voice stopped -- it's. And times. From going on have you had that voice assistant treasurer measure of their own tons of things that -- like on the soil and decided not to roar of -- the bottom of some things than just in my -- not doing -- I'm back down and gone home. Even Alex has had his moments frozen on a mountain. Fear fighting for a total hold alongside him. The business injuries and a permanent feeling sorry for yourself. And then it's -- -- -- better put together can Zagreb standing on a blank phase of you know. So I stood there permanently in -- can what do I Don and then I finished the climate. Being up professional mountain climber means being a bit of a nomad his sponsors seem to climb the world's most beautiful mountains. Year round. He's even popped up in the occasional -- TV commercial for -- -- when he's in the US he lives and travels out of his van. -- -- -- -- -- -- -- -- I met your -- we are gonna turn his life is at -- -- and extremely simple. It is endorsements including North -- he makes a good living but he says he spends virtually nothing on himself. Make him peanut butter and -- tortilla wrapped around his fears he says are no different from the rest of us down on solid ground. These -- scared of like speaking in public -- -- governor governor Rebecca who's got started but. During our time together Alex in cedar were in the midst of a grueling 700 mile bike in climbing trip which included stops for huddles charitable foundation. Providing solar panels to native American homes. Without electricity it's about as far from a nine to five lifestyle -- you can get and Alex -- -- core of mountains. -- no intention of slowing down this a job you can retire from. People retire. And that's the other lot of old cars this -- -- -- and you can go on the mountains like your whole life and just enjoy the Boston. Like I'm hoping that you don't like retirees granted -- I'm Neal Karlinsky for Nightline in Monument Valley Utah they.

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

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