Analysis of information sources in references of the Wikipedia article "Người Andaman" in Vietnamese language version.
... The Aka-Kol tribe of Middle Andaman went extinct by 1921. The Oko-Juwoi of Middle Andaman and the Aka-Bea of South Andaman and Rutland Island were extinct by 1931. The Akar-Bale of Ritchie's Archipelago, the Aka-Kede of Middle Andaman and the A-Pucikwar of South Andaman Island soon followed. By 1951, the census counted a total of only 23 Greater Andamanese and 10 Sentinelese. That means that just ten men, twelve women and one child remained of the Aka-Kora, Aka-Cari and Aka-Jeru tribes of Greater Andaman and only ten natives of North Sentinel Island...
The 72-square-kilometre-area North Sentinel Island is home to the fiercely independent Sentinelese tribe, known to reject any contact with outsiders. The Indian government carried out its 2001 census of the Island from a distance, counting a total population of 21 males and 18 females, although other estimates range higher, to a maximum of 500.
