1955 Bonatti Pillar: Six Days Alone on the Petit Dru

Solitude on the Granite Spire

In the aftermath of the 1954 K2 expedition—where Walter Bonatti had survived an 8,100m open bivouac only to be unfairly marginalized by the expedition leadership—Bonatti returned to Europe with a wounded heart. Seeking absolute independence and self-reliance, he decided to face the greatest unclimbed granite wall of the Alps: the 600-meter Southwest Pillar of the Aiguille du Petit Dru.

Climbing entirely alone, Bonatti carried five heavy sacks containing food, warm gear, hemp ropes, and over a hundred steel pitons.

The Legendary Pendulum Traverse

From August 17 to 23, 1955, Bonatti lived suspended on tiny hammocks and narrow rock ledges hundreds of meters above the Mer de Glace. On the fifth day, below the upper summit tower, Bonatti found himself trapped beneath an enormous, blank 40-meter granite roof with zero cracks for pitons. Retreat was impossible; forward progress seemed blocked by smooth stone.

In a moment of supreme alpine ingenuity, Bonatti gathered his surviving rope, coiled it, and threw it multiple times until he successfully lassoed a small detached rock horn forty feet to his left. Tying the line off, he launched into space on a breathtaking pendulum swing across the void, catching a microscopic ledge on the opposite wall.

The Bonatti Pillar

On August 23, 1955, Bonatti reached the summit of the Petit Dru. His six-day solo first ascent was acclaimed across Europe as one of the most astonishing individual feats of rock climbing in human history. The route was christened the ‘Bonatti Pillar’, standing for decades as a monument to courage, self-reliance, and the pure spirit of solo alpinism.