In which country is North Sentinel island located?

Maestro1313, It’s not a time warp . It is continuation and protection of their existence and way of life. And let’s face it, we can all name dozens of tribes and cultures which have not benefitted from contact with the outside world.

you go Sentinelese!

Yes it’s heavily guarded and they do not mess around. If you haven’t heard about this Darwin Award winner, here you go! From Wiki: John Allen Chau had been trying to reach members of an isolated and protected tribe to convert them to Christianity. The people of North Sentinel Island had fired arrows at him in warning, and on his third attempt to visit the island, they killed him.

Maestro1313, Since Player #25874027 has addressed the "time warp" issue, I will proceed with the "stuck" issue. To clarify, they are not "stuck". The explanation said voluntary, their choice, hence not stuck.

Maestro1313, it is their choice, their right.