In reply to Dave Perry:
> Why was he, "searching for a lost tribe".
From what I read, he'd already visited the tribe once before. If so, that would seem rather to stretch the meaning of the word "lost". More like: he was paying a return visit to some previous acquaintances who live in a pretty remote location which required negotiating some challenging terrain. I've got some friends in who live in Yorkshire who might qualify as "lost" by that definition, at least from the viewpoint of certain inhabitants of the Great Wen.
I'm also not entirely sure how you can "explore" somewhere you've already been - but perhaps that's implicit in his job title. The OED defines "explore" as "Travel through (an unfamiliar area) in order to learn about it,"
https://en.oxforddictionaries.com/definition/explore so I don't think my pedantry is
completely unreasonable...
The above is more by way of criticism of the way the incident has been reported, by the way, not of Benedict Allen himself.
Post edited at 12:56