Curse of the Amazon Dungeon

An infamous prison in the Amazon and a deserted military facility in the remote English countryside contain a haunting and deadly past; experts investigate the secrets of these remarkable places to uncover how they were built and why they were abandoned. This episode is a mashup of S07E05 "Factory of Death," S05E01 "Jungle of the Damned," and S03E07 "The Town That Disappeared."