and the other is just sort of human closeness. they -- they're sleeping shoulder to shoulder with each other over the course of a year on a remote ridgetop, completely interreliant on each other for their survival. out of restrepo, no internet, no phone, no tv, no nothing. they were just on a ridge with each other for a year. and that kind of intense human closeness, i think, actually reproduces our human evolution, our evolutionary past quite closely, and i think they come out of that experience really kind of missing it and missing the security of it. and they get back to this wide-open society, all of a sudden alone again. and i think it's very, very unsettling for them. those are the two things i think they really miss. >> this new film is a follow-up to junger's war documentary entitled "restrepo." we knew little about the last few years of nelson mandela's life.