Beyond the iron gates of the derelict pesticide plant where one of the world's worst industrial disasters occurred, administrative buildings lie in ruins, vegetation overgrown and warehouses bolted.

Massive vessels, interconnected by a multitude of corroded pipes that once carried chemical slurries, have rusted beyond repair. In the dusty control room, a soiled sticker on a wall panel reads "Safety is everyone's business."

On the night of Dec. 2, 1984, the factory owned by the U.S. multinational Union Carbide Corp. accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal.