Series 5

01 Disaster in the Desert Episode 121st January 2020 The desert town that faced a disaster of biblical proportions. Plus, vast coastal ruins that reveal a past once wiped from history. 02 The Valkyrie Assassin Episode 228th January 2020 The underground base with the power to destroy a nation, the site linked with an attempt to kill a dictator, and an ancient world discovered in the American wilderness. 03 Escape from Devil's Island Episode 34th February 2020 Claustrophobic prison cells that contain a story worthy of international acclaim, and a vast mountainside complex that held the power to change the world. 04 Top Secret Nuclear Arsenal Episode 411th February 2020 A secretive underground base that concealed the power to destroy nations, and a sprawling industrial relic clinging to the edge of an unforgiving waterfall. 05 A Nation Torn Apart Episode 518th February 2020 Including an exploration of a marooned iron-clad structure in Portland, off the coast of England, that hides a dramatic story of war and resilience; Pratt Cotton Gin Mill, a vast facility in the heart of America's deep south that helped tear apart a nation; and a Mediterranean island fortress at Spinalonga, Greece, that became the scene of a dark conspiracy. 06 Ghosts of the Swamp Episode 625th February 2020 Including an exploration of forgotten relics from the defence of America's homeland, at Fort Jackson, USA, concealed by the banks of the Mississippi River; a concrete behemoth at Lorient Sub Base, on the coast of France, that proved invulnerable to enemy bombardment; and a ghostly ruin at Gwrych that is now home to a haunting presence. 07 Death Behind Bars Episode 73rd March 2020 An American prison for the violent and deranged with links to an infamous cult leader, and a cavernous tunnel network in France offering shelter from unrelenting bombardment. 08 Behind Enemy Lines Episode 810th March 2020 An Albanian village home to Allied secret agents, devastated for resisting the Nazi war machine, and a notorious asylum in America that enforced lobotomies on a terrifying scale.