[Cronos]

He was an idiot. The North Sentinelese people have been cut off from the rest of humanity for 20,000 years.

If he landed there, he would have infected them with the germs from the past 20,000 years of human history. They would have died out.

The island is restricted access - the indian government doesn't govern it - it is governed by the Sentinelese. They shoot poison tip arrows at anyone who gets close

These are a very rare people -- related to the Aborigines and PNGers as the earliest humans who ventured out of africa

They may LOOK African but their genes are quite different from sub-saharan Africans and completely divergent from the Khoisan (Bushmen) and Pygmy populations (who themselves differ from Bantu speakers genes)

[Moonman62]

Those are very healthy looking teeth.

[ZULU]

I know.
Fascinating savages. Eventually they will all die out from inbreeding

[SunkenCiv]

There aren't any groups that have been isolated for 20,000 years. The only conceivable way to support a claim of such isolation would be documentary evidence, and there's not only no known evidence that the islanders themselves have indigenous written records that old, there aren't any 20K written records anywhere on Earth (that are known about and/or can be read; there is writing here and there among the cave paintings, but nothing intelligible).

The ancestors of the current group got there perhaps during the diaspora which also resulted in the colonization of Madagascar by Austronesian people. Generally the date for that settlement of Madagascar ranges from 5th c BC to 4th c AD; recently there has been claims of higher antiquity. Spotty evidence of some kind of human presence (hunting/foraging?) has been known for a while.

Most of the other Sentinelese languages are either extinct, or teetering on the brink, and the 14000 acre N Sentinel island probably doesn't support a large population. Census figures by the Indian gov't are not based on door-to-door contact because of the pathological xenophobia of the tribe. There may be fewer than 50 in the entire group.