India suffered a major disaster on 3 December 1984 when a Union Carbide chemical plant in the city of Bhopal suffered a burst valve in a 45 ton tank of methyl isocyanate due to a build-up of pressure.
Releasing a huge gas cloud, it killed thousands. Complicated by confusion over emergency drills, and slap-dash safety standards and cheap labour, many fleeing from the cloud were held up by a barbed wire topped concrete wall. The lucky ones were killed in the stampede; the unlucky died amid convulsions and vomiting. Overall, half a million people in the area were affected by the gas and people are dying of the after effects to this day.
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