Failsafe code in Vault 112
During the quest to find your father, stop by Vault 112. Once you enter the Tranquility Lane, stop by and talk to Betty. Once you have talked to her, go make the boy cry, then talk to her again afterward. Make your way into the abandoned house and activate these objects in the following order: radio, pitcher, garden gnome, pitcher, cinder block, garden gnome, and empty bottle. This will activate the portal to your right. Go to the terminal and follow through there.