Uncovering hidden structures built by the Nazis.
Ch1. Guernsey: Hitler's Island Madness
Documentary uncovering and examining hidden structures built by the Nazis, from tunnels to towers, artillery sites, resistance nests and communication centres. The first edition focuses on the Channel Island of Guernsey, which Hitler occupied and fortified over the course of five years.

Ch2. Maisy Batteries: A D-Day Cover-up?
A mile-and-a half of recently-excavated trenches, bunkers, barracks, and gun encasements near Pointe du Hoc, which tell a new story of D-Day.

Ch3. Villa Winter: Secret U-Boat Base?
On the Spanish island of Fuerteventura, Villa Winter was suspected of being a base for German U-boats and part of a larger plan to invade the United States.

Ch4. Kraftwerk Nord West
One of the largest Nazi bunkers ever constructed, outside the French town of Watten, a missile facility with storage for 108 missiles, a liquid oxygen factory and two launch pads.

Ch5. Bergkristall: The Atomic Threat
A secret weapons program in the heart of Austria that could have ended badly for the Allies - and may have indicated nuclear plans being concocted by Hitler.

Ch6. Dag Bromberg: A City in the Forest
As the Red Army approached a forest in Poland toward the end of the war, they stumbled upon a massive complex containing more than a thousand structures across 25sqkm.