While exploring the underground tunnels alone, Lena stumbles upon the former Nazi laboratory. There, she discovers CCTV footage showing Ada and children who disappeared from the same laboratory. Marta, for her part, maneuvers to have the investigation taken away from Rafal. The young police officer then reveals to his boss that his father committed suicide after participating in the restructuring project of a local mine run by Marta's husband. Rafal then gives Lena a video filmed on the fateful day she was taken away from her daughter Ada. Horrified, she sees herself trying to drown Ada. Marta then discovers that Lena knows about the secret laboratory where she conducts secret experiments...

When Lena returns to Ilse's house, her grandmother's spirit takes control of her own. Meanwhile, Marta discovers an underground lake that leads to a parallel reality, the perfect world of the Vrill. The energy emanating from this world can grant immortality and eternal health. Ilse's spirit guides the two children Marta is holding out of the sanatorium and back to Lena. Together, they head to a nearby lake before jumping into the water...