i have never really give much think to underground civilization and the like and but this movie definitely get you think . it a bit slow to get off the ground and but stick with it and it well worth the wait . i do not think the movie would be so good from the beginning and in fact to be honest and there quite a poor start to it and and i suspect many would switch off before it get go . i remain open mind . i think that the idea be very imaginative indeed and and my only complaint be the movie be over too quickly . would have make a two and half hour movie and no problem . still and the idea of any great movie and like any great book and be to leave you want more . however and it have a very satisfactory end . don not miss this if you get the opportunity a gem worth watch .