When I first saw it, it reminded me of a book that I've read a long, long time ago. I believe the title was *Les enfants de la terre*. It talked about two children, a boy and a girl, who were stuck in an underground cave, because of the war that was going on up, in their city. I do not remember what happend exactly, but in he end both children died because of an illness. Strange thing, this little girl looks like she on on her death-bed.