Inside a survival fortress, the leader Chelsea pressures a prisoner named Alan to plead guilty to save his secretary. Alan publicly counters that Chelsea herself sacrificed her husband to gain entry, calling her integrity into question and causing unrest among the onlookers. He reveals she once propositioned him for power, but Chelsea vows revenge. As an expedition team heads to the surface to prove Alan is lying about the outside danger, Alan chillingly predicts they will all die first, leaving the group's fate uncertain.