The things on their feet are called crampons and they allow you to walk without slipping even on steep icy terrain. For mountaineering they are an essential tool. It’s important to point out that the crevasses climbers cross are on glaciers that form high up in mountains. The giant slab of ice that’s clinging to the mountain is very slowly sliding down it. Therefore the terrain on top of it is an ever changing landscape of giant cracks in the ice that can be deadly. Finding a safe route across this ice does mean having to cross crevasses using equipment that can be carried and tied down and removed just as quickly.
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