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I tested every handhold for loose rocks and moved only in the thunderclaps of cannon fire as they echoed in the gorge.

“The beauty of ice is since you have these spikes on your feet and in your hands, you can make your handholds and footholds anywhere you choose.”

Although a fall from that height would have been very bad, there were endless handholds and I never felt unsafe.

They prefer climbing onto freight cars, which have flat tops with ladders and railings that offer handholds.

Marilyn Mason provides the wing walkers about three hours of training on the ground, where they learn the footholds and handholds used to climb across the airframe, and how to secure the harness on top.