'Mountain Bump' Among Mine Rescue Dangers

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The cave-in that killed and injured rescue workers at the Crandall Canyon mine is thought to have been caused by a "mountain bump" — when shifting earth causes rocks to fall from the walls.

J. Davitt McAteer, former head of the Mine Safety and Health Administration under President Clinton, talks with Robert Siegel about the science of bumps and the dangers associated with mine rescues.

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