For the first time, a study measures the fall of rocks and ice masses on the two most frequented routes to the roof of Europe. The objective dangers that lie in wait for climbers on both routes are of a very different nature.

On the slopes of Tacul, the average number of fatal accidents per year is 0.6, and the risk is twice as high as on the Voie Royale. However, on the route that passes through the Goûter refuge, the frequency of rock falls is much greater.