Where did the Black-Hole Tragedy took place?

 a) Dacca
 b) Monghyr
 c) Calcutta
 d) Murshidabad

SSC CHSL-2015

Calcutta Black Hole Tragedy is an incident depicts the dark side of Indian History. On June 20, 1756, Siraj-ud-daulah, the then Nawab of Bengal, captured Fort William and Calcutta (Kolkata), wherein lied the main power of the British East India Company. The British and Anglo- Indian prisoners of war were thrust in a small and stuffy dungeon at Fort William after the fall of the fort, which is referred to as the Black Hole of Calcutta. 146 people were reported to be imprisoned.