Urumqi, Xinjiang, China, April 3, 2009--Firefighters work to reach four workers trapped inside a collapsed hillside lime kiln, used to produce quicklime, a key ingredient in mortar and other compounds.

The workers' corpses were recovered three days later. The chance of their survival had always been slim, as temperatures at the kiln opening could reach 750 to 925 degrees Fahrenheit (400 to 500 degrees Celsius).

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