Episode 7

Bernard showed Lucas the advanced computer, Legacy, deep in the vault, which preserved all their secret knowledge and history, yet the origin of the silo 352 years ago is still a mystery.Lucas uses Legacy to conduct in-depth research and speculates that the letter may have adopted a book password.The Machinery Department sent paper information to the upper level, inciting citizens to question what the IT department concealed, and then cut off the power supply from the silo, revealing that the IT department has an independent power system.Bernard had a dispute with Sims, who was still angry that he was marginalized.Sims questioned Camille's actions, who explained that she tried to be friendly between the two sides for their safety and promised not to hide anything from him in the future.Meanwhile, Billings and Hank are tracking down the spy who is trying to create a split inside the Mechanical Department.Worried about Kara's safety, Walker briefly turned on a camera in the IT department and sent a message to the upper layer, which was intercepted by Bernard.At Silo 17, Juliet dived into the deep sea area to repair the water pump for Solo, but nearly died due to a sudden interruption of air supply.After surfaced, Juliet found traces of the fight and she began to suspect that there were other people in the silo besides them.