Nightly News | June 23, 2013
>>> finally tonight, no hands, no harness, no net. tonight 7th generation nick wall len da will try to become the first man to cross the grand canyon on a tight rope.
>> reporter: they make their final inspections. the wait is almost over . later tonight, 34-year-old nik wallenda will attempt another death defying act. a walk across the grand canyon a on a 2 inch cable, no safety net , no harness, all live on the discovery channel .
>> it's about fulfilling a dream.
>> reporter: it nots first time he's put his life on the line. he walked across nighing a gra falls last year.
>> the impossible is not quite impossible if you set your mind to it.
>> reporter: then he was 200 feet above the falls with the safety line attached. tonight he oolg'll 1500 feet above the canyon. on a cable that stretches 1400 feet long. about the length of four football fields. factor in possible winds.
>> it's the most challenging walk that i've ever done. i don't even want to talk about death.
>> reporter: he has had a few terrifying stumbles in previous stunts. but wallenda is at ease hundreds of feet above the ground.
>> the applying wallendas.
>> reporter: wire walking has been the family business since their circus act started in 1980 . over the years seven have died falling from the wire. so no one knows better than him that something could go terribly wrong.
>> the truth is it's life or death . and when i make it to the other side, we all know it's life.
>> reporter: well it took him half an hour to walk across nighing a gra falls and it's expected to take him the same amount of time to walk across the canyon.
>> you can watch that live on the discovery channel tonight at 8:00 eastern.