meaningless [C]ode A2 arrives at the Tower to find that Popola has passed away from her wounds while Devola is infected with the virus. After mercy killing Devola, A2 enters the Tower. Inside, 9S encounters copies of 2B which he relentlessly attacks and destroys, but one of them self destructs, destroying one of his arms. 9S salvages a 2B copy's arm to replace his own, disregarding the risk of infection. Meanwhile, A2 enters a library where she learns that the Tower is actually a massive cannon designed to destroy the server on the moon containing humanity's data, and that Project YorHa was deliberately meant to fail so that the truth of humanity's extinction will never be discovered...