20 June

The Black Hole of Calcutta was a small dungeon in Fort William, in Calcutta, India, where troops of the Nawab of Bengal, held British prisoners of war after the Bengali army captured the fort on this day in 1756.

One of the British prisoners, an employee of the East India Company, John Zephaniah Holwell, said that after the fall of Fort William, the surviving British soldiers and families, Anglo-Indian soldiers, and Indian civilians were imprisoned overnight in conditions so cramped that many people died from suffocation and heat exhaustion; and that 123 of 146 prisoners of war died.