During their escape, a traumatized Natalie is found and rescued, but when the group gets distracted by a mysterious young girl, Natalie is captured again. The rest of the group is swarmed by a horde of mutants and are forced to retreat. While fleeing through an underground passage, Michael is captured. As they continue, they find Chris' engagement ring for Natalie, with no sign of Chris. While climbing a ladder, a gang of mutants drags Zoe back down, forcing Amanda and Paul to leave her behind, emerging from the passage right beside the exposed reactor core. Paul recognizes that extremely high radiation levels are causing their skin to blister. They come upon Natalie's body just before they are confronted by some of their mutant attackers. Fighting them off, the two survivors then encounter Ukrainian military forces outside the reactor building. Blinded by radiation, Paul stumbles toward the soldiers, who kill him.