appears to start again. unlike a tight rope, the slack line is loose. it bounces and swings as christian tries to balance. the line is flat, but only one inch thick. christian is 3,280 feet in the air, that's nearly three times the height of the empire state building. slowly, cautiously, breathing deeply, christian places one foot in front of the other, bridging the gulf step by step. as he reaches the halfway point, of the 39-foot crossing, he starts singing to himself. a tiny voice in the vast canyon. seconds later -- >> woo-hoo! >> he's made it.