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Home to the Sentinelese tribe, North Sentinel Island stands as a fortress against the outside world. This uncontacted tribe violently protects their isolation, exemplified by their lethal response to outsiders. An American missionary met a tragic end when he attempted to spread Christianity among them in 2018. The Indian government enforces strict regulations prohibiting entry to protect both the people and the tribe from outside diseases, securing this island's spot among the most dangerous on Earth.