The Cellular Jail, also known as Kālā Pānī (Hindi for "black waters"), was a colonial prison in the Andaman and Nicobar Islands, India. The prison was used by the British especially to exile political prisoners to the remote archipelago. Many notable dissidents such as Batukeshwar Dutt, Yogendra Shukla and Vinayak Damodar Savarkar, among others, were imprisoned here during the struggle for India's independence. Today, the complex serves as a national memorial monument.