Extending 70 feet (21 meters) from the canyon wall, the 30-million-dollar Skywalk will put a few scant inches of glass between visitors and a 4,000-foot (1,220-meter) plunge to the Colorado River. As it was inched out by an industrial-strength pulley system yesterday, the glass bridge was balanced by half-million-pound (227,000-kilogram) steel weights on its back end. Once in place, the Skywalk was welded to four-story steel poles inserted into the canyon wall.
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