Rainer Petek's path is leading almost vertically upwards for about 1200m: it’s the north face of the Grandes Jorass, one of the most difficult mountains in the Alps.
With the courage to try something new, the professional mountain guide accompanied many people for more than a decade through numerous extreme routes in the Eastern and Western Alps.
Rainer Petek explains to our SBS correspondent Katharina Loesche his "North Face Principle”.
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