Nik Wallenda’s next highwire challenge involves an active volcano

The tightrope-walking daredevil takes on the “biggest challenge of his career” by walking above the active Masaya Volcano in Nicaragua.
5:15 | 02/27/20

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Transcript for Nik Wallenda’s next highwire challenge involves an active volcano
He's at it again. This time getting ready to walk the high-wire above the active Masaya volcano in Nicaragua. Oohnik will walk on a wire above molten lava 2,000 degrees. This isn't the first time NIK has pushed the envelope. Take a look. NIK Wallenda known for his death-defying stunts. History awaits. Reporter: At niagara falls, the grand canyon. Winds are way worse than I expected. Reporter: Just this summer in times square. I'm going to do this. What do you think, New York City? Reporter: Now his greatest attempt yet for the highest and longest high-wire walk he's ever done, NIK will attempt to walk over the active Masaya volcano in Nicaragua. To prepare NIK has been replicating the potential obstacles. There is heavy gases that can be so thick you can't see so I'll have to wear this gas mask. Reporter: Those sulfuric gases emmating from the volcano could cause serious side effects. Terry eye, sore throat, coughing, nasal congestion, tightening in the chest. Difficulty breathing. Starts out lower back. Reporter: His preparation going way beyond the wire. Breathe in as you go down. Reporter: This is by Farber the biggest challenge of my career. NIK Wallenda is joining us now from land but not for much longer. Thanks for being here. Ness what you do. Thank you. It really is. You say this is the biggest challenge you have faced so far, but how does wearing an oxygen mask and oxygen tank add to it. That's why it's one of the biggest challenge. It's not just walking a wire over times square. Of course there were distractions but here a 2,000 plus degree magma flow below me. The sounds are intense. But it comes with winds of the grand canyon and heavy gas that is deadly so I will have to wear a gas mask. There's very little oxygen in the air so training with an oxygen tank as well as a wire that we're not sure how it will work. It is really heavy. This is the actual type of wire that you'll walk on. A little thicker than what you usually do but that's not necessarily a good thing. No, it's not, my entire wife I've walked on what 5/8 and this is an inch and a quarter. We don't know how -- we've done studies but how it will react to it. We did a piece of test with half inch rope and after three months it crumbled in my hands. So Masaya is 1800 feet tall which is taller than the freedom you toer and 1800 feet long. It's six football fields and, again, it's an active volcano. So what is going through your mind when you're walking this? You know, I'm not focusing on any of the stuff you just mentioned. Thanks, Tom. Just a reminder. I'm focusing on what I'm doing, my skill, training, everything I've done in my backyard and putting myself back in my backyard ten feet off the ground rather than being 1800 feet above that volcano. So it's very much a mental game. In fact, I'm writing a book on overcoming fear and it's about categorizing thoughts in your mind and about categorizing and putting in my mind again in a spot that is safe. A book I would read. I mean if anybody knows it, it's you. I want to say my producer said your team in Nicaragua right now called you with an issue. Yeah. Really scary issue. I lost some sleep for sure over that. My dad called me the other night and said, we have some concerns. There's almost like a greasy substance that the volcano is emitting and we can't figure out what it is. And so I didn't sleep that night at all. First thing in the morning. That greasy substance could be on the wire. There could be an issue with my feet slipping so literally went into my subboard and pulled out a can of oil and greased a section and walked on it fully greased. My wife reminded me then, she said remember you did a walk in Baltimore 15 years ago and they sent the wrong cable and it was a fully greased wire and I went, yeah, you're right. So I've walked on a slippery cable in the past. That helps me mentally prepare for the potential of walking on a slippery cable. You say you use visualization to prep. What do you envision? Yeah, it's, again, all about putting myself in a safe condition. A lot of my mental prep as well is in the physical preparation so I walk in heavy wind, wind machines that create wins up to 90 miles per hour so that I know that, hey, the winds shouldn't exceed 40 miles per hour. I'll be fine at 90 miles an hour. Countering that with a positive thought of I'll be fine. We'll have positive thoughts for you. Thank you. I'm personally wondering what raises his blood pressure because, man, NIK, you're amazing. We cannot wait to see you and it is "Volcano live! With NIK Wallenda" Wednesday starting at 8:00 on ABC. NIK will join us live the morning after his high-wire cannot wait to see you next

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

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