The most catastrophic surge to date occurred on September 20, 2002, when a mass of ice, water and rocks streamed down a 4 km stretch of the valley. An icy mudflow travelled further 12 km. Ice within the debris began to melt almost immediately, creating new lakes and flooding some settlements built on the valley floor, contrary to the old traditions. The Lower Karmadon settlement was totally ravaged. The height of the mudflow peaked at 140 m; the height of the debris near the wall of the Skalisty Ridge reached 100 m. At least 125 people were killed.

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