Jonathan Watts in The Guardian:
Boa Sr, who lived through the 2004 tsunami, the Japanese occupation and diseases brought by British settlers, was the last native of the island chain who was fluent in Bo.
Taking its name from a now-extinct tribe, Bo is one of the 10 Great Andamanese languages, which are thought to date back to pre-Neolithic human settlement of south-east Asia.
Though the language has been closely studied by researchers of linguistic history, Boa Sr spent the last few years of her life unable to converse with anyone in her mother tongue.
Even members of inter-related tribes were unable to comprehend the repertoire of Bo songs and stories uttered by the woman in her 80s, who also spoke Hindi and another local language.