Beneath, the group find a vast chamber beneath with a multistorey structure, containing a small army of frozen Cybermen. Back in the control room, Kaftan drugs Victoria and reseals the hatch. Using the controls Klieg revives the Cybermen and betrays the group, killing Viner when he tries to stop the process. As the Cybermen emerge, Klieg reveals that he and Kaftan belong to the Brotherhood of Logicians, a cult that possess great intelligence but no physical power. He believes the Cybermen will be grateful for their revival and will ally themselves with the Brotherhood to conquer the universe. After they awaken, the Cybermen revive their leader, the Cyber-Controller, and take the group as prisoners. The Doctor realizes that the tombs are actually an elaborate trap, with the Cybermen keeping themselves frozen until they were revived and rebuild their invasion force to conquer Earth.