Thirty Years of Protection and Betrayal

Diana and Evelyn produce footage of the surface showing calm, ordinary days out in the open. None of it is real. Evelyn is Alex's adopted daughter, and Alex is the man who traded years of his own lifespan to build the bunker and keep humanity inside it for thirty years. The faked recordings turn the bunker's people against him, and he is taken to the gallows. Believing the surface is safe, the survivors blow open the bunker and head for the oasis they have been shown. The Giants and Diana had arranged it that way, to hold the people like livestock. The Giants drop the pretence and the killing starts. Alex has been working on mecha technology all along, and has to decide what to do with it.