Comment: There is a pre-built

(See in situ)

There is a pre-built

There is a pre-built underground structure up there. It's nice sized and used occasionally in the summer (or was). It's location is hidden, people are taken there blindfolded.

How do I know? I've been there. If he hid overnight, then moved in during the snow - there would be no tracks, and he's safe from drones. It's pretty deep too.

It's possible he was a member of the group that get taken there. I was.