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Modern Marvels - Coal Mines

Seizoen: 9 - Aflevering: 14 / 252 - Eerst uitgezonden: 02 april 2003 - Episode ID: 614661

Coal--the fuel responsible for more than half the electricity used daily. We unearth the amazing technological advances that have led to today's extremely efficient methods--from ancient techniques to the simplistic bell-pit method, from drift mining, surface mining, and strip mining to modern longwall mining, when a massive machine extracts an entire wall of coal in seconds. We go underground with miners in West Virginia, Pennsylvania, and Wyoming, and also address environmental concerns.