North Sentinel Island. The 86 survivors reached the beach in the ship's boats. On the third day, they were attacked with iron-tipped spears by naked islanders. One person from the ship escaped in a boat and the others were later rescued by a British Royal Navy ship. For some time, sickness and mortality were high, but swamp reclamation and extensive forest clearance continued. The Andaman colony became notorious with the murder of the Viceroy Richard Southwell Bourke, 6th Earl of Mayo, on a visit to the settlement (8 February 1872), by a Pathan from Afghanistan, Sher Ali Afridi. In the same year, the two island groups Andaman and Nicobar, were united under a chief commissioner residing at Port Blair. From the time of its development in 1858 under the direction of James Pattison Walker, and in response to the mutiny and rebellion of the previous year, the settlement was first and foremost a repository for political prisoners. The Cellular Jail at Port Blair, when completed in 1910, included 698 cells designed for solitary confinement; each cell measured with a single ventilation window above the floor. The Indians imprisoned here referred to the island and its prison as Kala Pani ("black water"); a 1996 film set on the island took that term as its title, Kaalapani. The number of prisoners who died in this camp is estimated to be in the thousands. Many more died of harsh treatment and the strenuous living and working conditions in this camp. The Viper Chain Gang Jail on Viper Island was reserved for troublemakers, and was also the site of hangings. In the 20th century, it became a convenient place to house prominent members of India's independence movement. Japanese occupation The Andaman and Nicobar islands were occupied by Japan during World War II. The islands were nominally put under the authority of the Arzi Hukumat-e-Azad Hind (Provisional Government of Free India) headed by Subhas Chandra Bose, who visited the islands during the war, and renamed them as Shaheed (Martyr) & Swaraj (Self-rule). On 30 December 1943, during the Japanese occupation, Bose, who was allied with the Japanese, first raised the flag of Indian independence. General Loganathan, of the Indian National Army, was Governor of the Andaman and Nicobar Islands, which had been annexed to the Provisional Government. According to Werner Gruhl: "Before leaving the islands, the Japanese rounded up and executed 750 innocents." Post-World War