"sixth grade" in six-tier scale of alpinistic difficulties proposed by Willo Welzenbach (corresponding to 5.9). Thirty years later UIAA used this as a basis

1934 Nanga Parbat climbing disaster

that followed, three famous German mountaineers, Ulrich Wieland [de], Willo Welzenbach [de] and Merkl himself, as well as six Sherpas, died of exhaustion

Großes Wiesbachhorn

Northwest Face (Nordwestwand) on 15 July 1924 by Franz Riegele and Willo Welzenbach. They were the first ones to use ice nails (Eisnägel) to assist them;

Nanga Parbat

that followed, three famous German mountaineers, Ulrich Wieland [de], Willo Welzenbach [de] and Merkl himself, as well as six Sherpas, died of exhaustion

Grade (climbing)

grades of level 0 and level 00 were added. In 1923, German mountaineer Willo Welzenbach [de] compressed the scale and reversed the order so level 00 became

Willo Welzenbach

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Monte Civetta

"sixth grade" in six-tier scale of alpinistic difficulties proposed by Willo Welzenbach (corresponding to 5.9). Thirty years later UIAA used this as a basis

1934 Nanga Parbat climbing disaster

that followed, three famous German mountaineers, Ulrich Wieland [de], Willo Welzenbach [de] and Merkl himself, as well as six Sherpas, died of exhaustion

Großes Wiesbachhorn

Northwest Face (Nordwestwand) on 15 July 1924 by Franz Riegele and Willo Welzenbach. They were the first ones to use ice nails (Eisnägel) to assist them;

Nanga Parbat

that followed, three famous German mountaineers, Ulrich Wieland [de], Willo Welzenbach [de] and Merkl himself, as well as six Sherpas, died of exhaustion

Grade (climbing)

grades of level 0 and level 00 were added. In 1923, German mountaineer Willo Welzenbach [de] compressed the scale and reversed the order so level 00 became