Sentinelese Tribe || Uncontacted by Modern Civilization.

Sentinelese Tribe
Perhaps no people on Earth remain more genuinely isolated than the Sentinelese. They are thought to be directly descended from the first human populations to emerge from Africa, and have probably lived in the Andaman Islands for up to 60,000 years.

The Sentinelese also known as the Sentineli are the indigenous people of North Sentinel Island in the Andaman Islands of India. They resist contact with the outside world, and are  last people to remain virtually untouched and un-contacted by modern civilization.The Sentinelese maintain an essentially hunter-gatherer society subsisting through hunting, fishing, and collecting wild plants. There is no evidence of either agricultural practices or methods of producing fire.

Sentinelese Tribe of North Sentinel Island

Their island is legally a part of, and administered by, the Indian Union Territory of Andaman and Nicobar Islands. In practice, however, the Sentinelese exercise complete sovereignty over their affairs and the involvement of the Indian authorities is restricted to occasional monitoring, ever more infrequent and brief visits, and generally discouraging any access or approaches to the island with firing arrows. 

In 1879, an elderly couple and some children were taken forcefully to the island's 'main town', Port Blair by some Britishes who wished to survey the island and and to take a prisoner according to British policy regarding unwelcoming tribes at that time. But in the aftermath, the whole group sickened rapidly and the old couple died, probably from the external communicating disease to which they did not have immunity, which compelled the British authorities to send the four remaining children to their home. Despite being responsible for two deaths, and quite possibly the starting of epidemic among-st the islanders, the British officers expressed no remorse, but merely remarked on the tribe with idiotic expression and manner of behaving.

Since then Indian authorities and 'National Geographic' crew visited the island and all are welcomed with a curtain of arrows and casualties. It is quite evident that these people do not want any external contact to the world and continue to resist anyone who comes near. 
Their hostility to outsiders, though, is easily understandable, for the outside world has brought them little but violence and contempt.

Sustained contact with the Sentinelese would almost certainly have tragic consequences.