A young newlywed couple find themselves trapped in a network of underground caves. With her husband injured, the new bride is forced to find her way back to the surface in order to save his life. In the process, they discover a terrifying truth about the "underneath", they are not alone. Something evil is hunting them.
They come from all over the world but they have one thing in common The Foreign Legion, their new family. The film tells their stories of women struggling to keep their love alive, men who leave for battle, and couples forming on hostile ground.