5 Most Mysterious Uncontacted Tribes

5 mysterious uncontacted tribes that hid from the outside world, including video and photos of some who remain unknown to modern science. Dark5 explores the dark depths of the Amazon, an isolated island, a remote desert, and the dense jungle of Vietnam. Subscribe for new Dark5 ►► Watch More Dark5: Like Dark5 on Facebook ► Follow Dark5 on Twitter ► Brazil Tribe photos CC 2.0 by the Brazilian state of Acre.