Light and dark, adventure and exploration, friendship and cold … On February 12th and 13th 2023 François Cazzanelli, Emrik Favre and Stefano “Teto” Stradelli opened “Couloir Isaïe” (M8 – 7a/7a+ – AI5, 600m), a new route on the west face of the Aiguille Noire du Peuterey, in the Mont Blanc Range.