Homem do furo

...friends and family are gone. Everyone else you have ever known has vanished. Forever. The loneliness seems unimaginable. But this is reality for one solitary native Brazilian Indian living on a small island of Amazon rainforest amid a sea of cattle ranches and soya plantations.

Virtually nothing is known about him, except that he seems to be the last survivor of his group or people. He has been nicknamed the Man of the Hole because he digs holes a metre wide and 3 metres deep inside little houses that he builds from palm leaves. No one quite knows why he does this. Could they be bolt holes? He also builds huge holes lined with spikes in the nearby forest to trap large animals.

-- from New Scientist (also here).