Part of the movie focuses on how to climb a mountain and how people used to do it in the past. Back in 1970 Maestri drilled more than 300 bolts into the rock face as he went up the mountain. That’s more hard work than actual climbing. Nowadays, alpine climbing is all about style, about using clean style. There are two ways to climb a mountain: free climbing or aid climbing. In aid climbing you can use any means you like. You can pull yourself up on bolts, use safety points, you can even use an ascender. And then there’s free-climbing, which has nothing to do with climbing without ropes, it’s about using the natural structure of the rock face. That means you can never ascend by using the rope, or use it as a means to cross certain sections. Everyone has to find their own style. To me a clean style is using as little means as possible that might interfere with the mountain and to accept the impossible.