Sidonia no Kishi Episode 8 English Subbed Episode Title:Immortality.Episode Description:The Samari, Nakazono and Kunato squads split up and confront Gauna 489, 490 and 491. While Gauna 491 and 489 are destroyed by the Kunato and Samari squads, Gauna 490 communicates via radio with Shizuka's voice after killing each member of the Nakazono squad. When Hō Honoka and Ren Honoka attack Gauna 490, Hō is killed before Gauna 490 retreats, thereby aborting the mission. The surviving pilots later mourn the loss of five fallen comrades. Hiyama learns from Kobayashi that Nagate is immortal and naturally skilled, hence why he is deployed for every mission. Afterwards, Hiyama recalls 100 years ago after the Fourth Gauna War when Ochiai was spared from execution because several archives from Sidonia were copied into his brain, then relocated to an auxiliary database and transferred into his clone. After the incident, Saitō disappeared without a trace, only reappearing 14 years ago, 80 years after the breach, as an elderly man renouncing his immortality. Later, with Hiyama's help, Saitō kidnapped his own infant clone, claiming that he would teach him how to become a Garde pilot. In the present, a Gauna placenta sample retrieved by Nagate is currently in containment, having the same appearance and voice as Shizuka.