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Years pass, and Eva becomes an expert in survival, honing her skills meticulously in the simulation room. As her sixteenth birthday approaches, anxiety mounts as the time for her final exam nears. One fateful night, driven by curiosity, Eva discovers a secret passage and uncovers evidence of other children who once inhabited the sanctuary. This revelation sets her on a path to find others like her.

When an alien creature attacks Sanctuary 573, Muur initiates a security protocol, urging Eva to escape. With her mother's sacrifices becoming evident, Eva flees, only to face the unknown on the surface, a world rife with incredible and dangerous creatures. As she navigates through this alien landscape, Eva's journey of self-discovery intertwines with her quest for other survivors.