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Don't look down... 1,500ft up and no harness

Florida aerialist Nik Wallenda has completed a tightrope walk that took him a quarter mile over the Little Colorado River Gorge in northeastern Arizona.

Wallenda performed the stunt yesterday on a 2in-thick steel cable, 1,500ft above the river on the Navajo Nation, near the Grand Canyon.

He took 22 minutes, pausing and crouching twice as winds whipped around him so that he could get "the rhythm out of the rope".

Wallenda, who did not wear a harness, murmured prayers along the way.

The event was broadcast live on the Discovery Channel.

Winds blowing across the gorge were expected to be around 30mph. Wallenda told Discovery after the walk that the winds were at times "unpredictable" and that dust had accumulated on his contact lenses.

"It was way more windy and it took every bit of me to stay focused the entire time," he said.