Benedict Allen, 57, had no mobile phone or GPS device with him when he was dropped by helicopter in a remote jungle to begin an expedition.
He hoped to reach a remote tribe, thought to be one of the last on Earth to have no contact with the outside world, but was discovered by a Christian missionary worker at a remote airstrip in the heart of the country where roads have been cut off because of tribal fighting.
See many of Benedict Allen’s adventures”
https://www.benedictallen.com/