9. Their Roots Are in Africa
One thing we know for sure is that the inhabitants of North Sentinel Island are a dark-skinned ethnic group. It is very much possible that this group of people has originated from Africa. The Survival International is actually a human rights group that focuses on preserving indigenous tribes and according to them, migration is the reason why this group of tribals are now settled closer to India.
So, if that is true then it is also possible that they made their way through to Indonesia first and then found their way to the North Sentinel Island, at least 60,000 years back.