Workers climb Gateway Arch in search of stains

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ST. LOUIS, MO (KTVI) - History is being made today at the Arch as crews are repelling down the outside of the iconic symbol for the first time since it was built.

A team of workers is laying cables and brackets as two of them slowly repel and scale down the north leg of the Arch. They`re repelling so that they can take samples from a stained area of the Arch. Those samples will tell crews if the stains are doing damage to the Arch and need to be cleaned.

The National Park Service says the work is very challenging. The area where the crews will ultimately take the samples from is 425 feet off the ground. We`re told in addition to the cables, the crews will also use suction devices to make sure they`re safe while taking the samples.

The project could continue through tomorrow and possibly into the weekend.