They've kept their culture, they survived the tsunami, and any outsider who gets within shooting distance gets an arrow in the neck.
The Jukka people in Suriname was like that too until recently... no one couldn't come in they territory. They are the only Africans (that I know of) who were kidnapped to the west but still retained their language and culture intact. They escaped as soon as they were brought to Suriname and set up their ting in the bush.