Nik Wallenda says there were some tense moments Sunday, as he walked across the Grand Canyon on a two-inch steel cable, 1500 feet above the river below.
Wallenda, the first person to cross the canyon without a tether or safety net, says he wasn't prepared for the movement in the cable and forced himself to concentrate on every step.
"I wasn't prepared for the movement of that cable and what happened is the tension dropped down. We knew it was going to vary a little bit by temperatures throughout the day and would change the tension on the cable. But it dropped down to about 62 thousand pounds. We wanted it at 65 and because of that it was moving pretty wildly under my feet," Wallenda told the Today show Monday.
He says he was thinking about his great-grandfather, who lost his life on a cable in San Juan, Puerto Rico.