Transcript for Julie Andrews and ABC News' Diane Sawyer Return to 'The Sound of Music'
Welcome back tonight. And we all remember that scene from "The sound of music," but don't let your eyes deceive you. That is Diane sawyer there, not Julie Andrews on that same mountain, which, by the way, is privately owned. Not on any map or gps. But Diane and the team retracing the untold story of "The sound of music" 50 years later. Diane is here. We should point out, there's no sign on that mountain. No. We didn't know what she went through to get that scene down. How hard could it be to twirl? Turns out, it took her nine times. She was knocked about, the downdraft from the helicopter. And then we discovered, even getting there is a feat. Wow. Is this it? Is this it? ? here we are, the view exactly as it was half a century ago, but the day we're there, it's sunny. Julie Andrews wasn't so lucky. So, I went to your mountain. I want to know how you did that. How I got up there? Oh, my. It rained a lot. The tarp over your head. Freezing cold, waiting for the clouds to part. I know. We actually went up the mountain in big open carts pulled by oxen. I would sit on top of all the camera equipment. On that day, we were shooting on the mountain, we're lucky. We have small silent drones getting the shot. Back in 1965, Julie Andrews was doing battle with a helicopter. That kept blowing up a tornado of wind. This giant helicopter came at me sideways with a very brave cameraman hanging out the side and I'd make that big turn and then he'd go around me to go back and start again. But every time he went around me, the downdraft from the jets would fling me down into the grass. I heard that occasionally you curse like a sailor. I do. No, I do. And I did. But somehow, out of that duel with the helicopter, somehow out of the long hours and the cold and the exhaustion, in that 20 minutes of sunshine, the giant speakers up in the trees -- These huge, big speakers in the trees were blasting this beautiful music. And for tall of us, an indelible moment, celebrating the simple joy of being young and alive. ? The hills are alive with the sound of music ? That song will be playing in our heads straight through your special tonight. You go back to the real house, the real staircase, the real abbey. There are so many surprises behind the scenes. I think you're going to love this movie in a whole new way. That's tonight, Diane. "The untold story of the sound of music" airs tonight, 10:00 P.M. Eastern right here, and we'll all be watching. We hope to see you right back here tomorrow night. Until then, good night.
This transcript has been automatically generated and may not be 100% accurate.