The site of the deserted Union Carbide factory in Bhopal, India. Twenty-five years after an explosion causing a mass gas leak, in the Union Carbide factory in Bhopal, killed at least eight thousand people, toxic material from the 'biggest industrial disaster in history' continues to affect Bhopalis. A new generation is growing up sick, disabled and struggling for justice. The effects of the disaster on the health of generations to come, both through genetics, transferred from gas victims to their children and through the ongoing severe contamination, caused by the Union Carbide factory, has only started to develop visible forms recently. Photograph: Sanjit Das