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Watch Horizon online: Episode 12 Anatomy of an Avalanche

Horizon reports on a February 1999 catastrophic avalanche at Galtr in Austria that claimed 31 lives. Over the next six months, Horizon followed a team of scientists as they pieced together the extraordinary chain of events that led to the disaster. The scientists' investigations into the extreme forces of nature responsible for the tragedy are making people re-evaluate their calculations about avalanches.

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