This story really helps fill in the other side of a part of Skythia's story, from the perspective of the Skythian employees who were tasked with trying to hide their flying city from some unknown, unseen apocalypse. Falling mostly between chapters 5 and 7 of Forget What You Can't Remember, if you pay close attention you can see some of the ways the 'doomsday event' they were trying to protect themselves from changed their lives in ways they didn't even notice.