It’s normal for doctors to be summoned at odd hours to deal with medical emergencies. It’s the nature of the job. But when Dr. DK Satpathy was shaken in the wee hours of Dec. 3, 1984, he was completely unprepared for what he would see. He had no idea that the worst industrial disaster in the history of the world was unfolding in his city Bhopal, capital of the then-largest Indian state Madhya Pradesh.