Last week we read about the American missionary who was shot dead with arrows after travelling to the Andaman Islands to teach tribespeople about Jesus.
Many were interested to read about the possible reasons behind why John Allen Chau was killed, with one theory stemming from as far back as the 1880s which led a to hatred of outsiders.
Now, advocacy group Survival International estimates that there are more than 100 'uncontacted' tribes around the world that exist today.
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Insider has reported that environmental destruction and exploitation - for example clearing forests for farms - put many of these groups at high risk.
The tribes across the world face a lot of challenges, but some are left completely alone and manage to avoid the outside world because of their geographic isolation with some living in the most remote corners of the planet.
According to Insider, the West Papua region in Indonesia is estimated to host more than 40 uncontacted groups while many others live in the Andaman Islands, situated between India and the Malay Peninsula. However, the majority live in South America, deep in the Amazon rain forest.
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National Geographic believes that Brazil has the highest number of uncontacted people, estimating around 84 tribes.
What being part of an uncontacted tribe does mean is that the people within them are susceptible to diseases from the outside world which is one reason many support their continued isolation.
Survival International say that tribal people are being 'illegally evicted' from land in the name of 'conservation' and are now being accused of poaching because they hunt for their own food.
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The tribespeople can face arrests and beatings, torture and death and yet fee-paying hunters are encouraged to continue.
Last week it was speculated that John Chau should never have travelled to the island and authorities haven't even attempted to send police to question the tribe, who have greeted outsiders with hostility for decades, according to Sky News.
One theory emerged explaining one potential reason for tribespeople to react in the way they did to Mr Chau's arrival.
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The Twitter thread pointed towards Maurice Vidal Portman, a Commander who had contact with the island in the 1880s. It's thought that he abducted an elderly couple from the tribe who soon died, which could have been due to their lack of immunity from illnesses.
From this point, the Sentinelese hid from Portman each time he visited and may be the reason they became hostile to outsiders.
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