Question: Is it possible that there is an unknown tribe of humans that are living somewhere

Oliver Gordon answered on 5 Mar 2019:

I’m not an expert in this – but we certainly know of quite a lot of tribes on remote islands that we have not contacted. So there’s several that are unknown, if only because we haven’t contacted them.

This was very recently in the news – there’s a tribe in an area called the North Sentinel Islands, who very clearly do not want to be contacted by the rest of society. On the whole we respect that, and as such they are very much unknown to us. You aren’t allowed to go to the island, either. Somebody ignored that warning, disrespecting the tribes’ wishes, and was attacked.