Massive rockfall caught on video on Piz Cengalo mountain in Switzerland

Ralf Dujmovits, Salomé von Rotz and Nancy Hansen were climbing the Cassin Route on Piz Badile in Switzerland's Bergell Range when they captured this incredible moment. The unstable north wall of neighboring peak Piz Cengalo was spitting large blocks of rock all morning. In early afternoon, the mountain let go of a huge amount of granite, as seen in this video. But they knew it still wasn't the big event the Swiss geologists and engineers were expecting - that happened two days later. An estimated four million cubic meters of rock came down, causing several deaths, chaos and evacuations of huts and villages.