For at least the last 20 years, a solitary indigenous man has been living entirely by himself in the Amazon rain forest. Known as “The Man of the Hole,” he’s believed to be the last surviving member of an uncontacted tribe.

His existence first came to light in 1996, and the Brazilian authorities launched expeditions to ensure his safety and preserved a 31-square-mile area in order to protect him from the encroachments of ranchers and loggers.

His nickname derives from the mysterious hole he digs in the floor of each of his palm thatch huts — more than 5 feet deep, rectangular, and serving no clear purpose. (A village of such huts had apparently been destroyed by settlers in 1996.) He’s been spotted a few times, a naked man with a bow and arrow who would now be in his 50s.

In 2009, gunmen believed to be ranchers attacked the man, but he’s believed to have escaped. Survival International director Stephen Corry told the Guardian, “His tribe has been massacred and now the ‘man of the hole’ faces the same fate. The ranchers must allow this man to live out his last days in peace on his own land, and the authorities must do all they can to protect it.”

(Thanks, Steve.)