Daredevil Nik Wallenda is set to walk on a high-wire across Niagara Falls tonight, but television executives overseeing the filming of the stunt have insisted he wear a safety harness – something that greatly increases his chances of survival in case of a fall, but takes away a good deal of the danger.
However, speculation is rife that Wallenda will unhook the tether somewhere in the middle of his walk. If he does so, he will turn the trick into a genuinely life-threatening feat and join some of the people below in risking it all for a headline-making thrill.
