In this Tuesday, March, 25, 2014 photo provided by Abseilon USA via AZ Photos, a technician dangles from a series of ropes before polishing the underside glass at Grand Canyon Skywalk in Hualapai ... more 
In this Tuesday, March, 25, 2014 photo provided by Abseilon USA via AZ Photos, a technician dangles from a series of ropes before polishing the underside glass at Grand Canyon Skywalk in Hualapai Reservation, Ariz. The more than 40 panes of glass underneath the horseshoe-shaped bridge on the Hualapai reservation aren’t easily accessible. The structure juts out 70 feet from the edge of the Grand Canyon, offering visitors a view of the Colorado River 4,000 feet below. (AP Photos/Abseilon USA, AZ Photos, George Walsh) less 
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Associated Press
Tue, Mar 25, 2014 8:15 PM EDT