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On the night of December 2-3, 1984, around 40 tons of methyl isocyanate (MIC) vented from tank E-610 at the Union Carbide India Ltd. pesticide plant in Bhopal, Madhya Pradesh. By dawn, the gas had reached settlements that had grown to within meters of the plant fence — JP Nagar, Kazi Camp, and others where there had been only open buffer in 1969. Estimates of immediate deaths range from 1,754 (Indian government, low) to 3,500-3,800 (Broughton 2005 peer-reviewed) to 7,000-10,000 (Amnesty International 2004) to 25,000-30,000 (ground accounts). Cumulative deaths over the following decades reach ~23,000 (ICMR 2008). Approximately 500,000 people were exposed. ~531,881 disability claims were registered. The popular story names a saboteur, a careless operator, or weak Indian regulation. The st...
Popular framing: A worker sabotaged the tank, or an operator made a fatal mistake. Find the bad actor and the disaster is explained.
Structural analysis: By 22:30 on Dec 2 1984 the failure was already paved. Six engineered and social safety barriers were down or degraded across a four-year multi-organization cost cascade. UCC HQ ordered cuts; UCIL implemented them; the 1982 Tyson audit was retrofitted at the West Virginia plant but not at Bhopal. Distance compression brought JP Nagar to within meters of the fence line; the 1982-1984 staffing cuts dropped the MIC operating crew 12→6 and training 6 months→15 days. Whoever opened the valve was the last weak link in a chain forged over four years. The cascade — not the spark — determined the outcome.
