S4 E1 · A Secret Canal
With Nazi Germany's rise to power, a long-abandoned canal project in East Prussia is resurrected.
All episodes for series 4 of Secret Nazi Bases
S4 E2 · Darkened Turrets
As Hitler's shadow engulfs Europe, ancient castles across the continent fall under Nazi control.
S4 E3 · A Secret to Win the War
In 1942, a mysterious technology is facilitating a deadly Blitz.
S4 E4 · Vengeance Under the Dome
As Allied bombing raids escalate, a massive concrete dome rises from the French countryside.
S4 E5 · Island Battleship
A small island fortress off the coast of France becomes the stage for a harrowing act of Nazi defiance.
S4 E6 · Wolves in Wolves' Clothing
A sprawling Nazi complex in East Prussia becomes the nerve centre of Hitler's empire.
