Nik Wallenda on his way to the Niagara Falls record June 15, 2012. - AFP file pics
Nik Wallenda on his way to the Niagara Falls record June 15, 2012. - AFP file pics

FLAGSTAFF, Arizona, June 24 – Record-breaking US daredevil Nik Wallenda was set to make history again yesterday by walking across the Grand Canyon on a tightrope, 450 metres above ground over the world-renowned landmark.

Wallenda, who last year was the first person to walk across the Niagara Falls, will be rigged up with multiple cameras and microphones broadcasting the death-defying feat live around the world.

And unlike the Niagara Falls walk, the 34-year-old will wear no safety harness for the stunt, likely to take him 25 minutes in searing temperatures over the famous tourist attraction.

At Niagara, Wallenda – who first walked the wire aged 2 – braved strong winds and heavy spray to walk on a cable suspended 60 metres above North America's biggest waterfall, on the US-Canada border.

Yesterday he was to step out into the void over six times higher – a height greater than that of the Empire State Building – with nothing but a 5-cm thick steel wire between him and the rocky canyon bottom.

Wallenda: Faith overcomes fear.
Wallenda: Faith overcomes fear.

The walk is set to begin from 6:00 pm yesterday (0100 GMT Monday), an hour or two before sunset over the Grand Canyon, and would be broadcast live in 219 countries by the Discovery Channel, whose coverage would begin at 5:00pm.

On Saturday, organisers described conditions at the walk site, in a remote area at the eastern end of the Canyon, as "very windy".

Wallenda has been planning the walk for about four years, homing in on a remote location at the eastern end of the mighty geological chasm, on land operated by the Navajo Nation Parks and Recreation.

He began final training in Florida weeks ago, boosting stamina by walking repeatedly along a 300-metre long rope, and using wind machines to simulate gusts of up to 80 km/h.

The Grand Canyon walk could potentially be delayed in the unlikely event of winds of above 72 km/h, or if there was a risk of lightning. A new attempt could then be made the following day.

There will be a seven- to 10-second delay on the live broadcast.

Wallenda, a seventh-generation member of the Flying Wallendas circus family, said that as he stepped out he would be thinking of his great-grandfather Karl Wallenda, who died in 1978 after falling from a tightrope.

He has trained for the worst, and said that – unlike his great-grandfather, who had an injured collarbone and double hernia, and grabbed vainly for the wire before falling to his death – he would be able to hold on if necessary.

"It's not like I just grab with my hands like people visualise. I wrap my legs round it, my hands round it, I hug that wire like a bear hug until help comes. I've got rescue teams that would be with me within a minute," he said.

That help would be in the form of rescue trolleys, which hang underneath the cable and could be rolled out in seconds on a winch system to Wallenda, clinging on for his life.

The Florida-based adventurer, who travelled to the Grand Canyon on Thursday for final preparations, said his Christian faith was important.

"What I get from my Christian faith is that I know where I'm going to go when I die. And that affects my business, because what I do is risky, and if I die, I have peace," he said.

"I'm not scared of dying." – AFP