Climbing the 'AV-Riss' (AV-Crack) in the Tennen Mountains is a quintessential alpine challenge. Graded 6+ (UIAA VII- or VII), this route is renowned for its sustained crack climbing through solid limestone. It demands excellent technique, physical endurance, and a strong mental game. The exposed pitches offer breathtaking views of the surrounding massif, making the effort worthwhile. While often well-protected, the alpine environment requires careful route-finding and awareness of weather conditions. It's a classic that provides a truly memorable and rewarding experience for experienced climbers.