they landed without incident. last tuesday, another one had to be diverted due to an oil filter problem. it was grounded in january because the battery system was catching on fire. nick wallenda, you are a braver man than i. wiser, not so sure. braver, definitely. the daredevil completed what may be the greatest of his death defieing stunts. he walked on air, across the grand canyon. it was on a wire. no harness. we watched it all. >> shoes feel slippery. there's dust on the cable. >> reporter: it didn't start well. >> need to relax more. hard to relax 1500 feet above the canyon. >> reporter: death defieing, vertigo endeucing thrill. a two-inch cable stretching across the little colorado liver. >> i'm not liking it.