An speleologist, his wife and a friend seem to be the only survivors on earth when they regain surface after an underground exploration. I was a little disappointed by this film, since I hoped to find something similar to those old science fiction from the fifties, not so much based on special effects, but on the philosophical questions related to nuclear destruction, the end of the world, and so on. Instead I found a superficial study of the three surviving characters, not very deep in any case. We never get to know what is the cause that everybody on surface died and the only survivors are these three people who were in a cavern or alike. Anyway, it is not very long, so you won't waist a lot of your time watching it.