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Secrets of the Underground uncovers the hidden world beneath our feet using cutting-edge technology. Explore the mysteries of underground tunnels, caves, and structures that hold clues to our past and present.

The collapse of the Third Reich left as many secrets as it did relics. Still today, remnants of the Nazi's schemes lie concealed in structures scattered across the globe. Skeletons of projects give way to mysteries. Conspiracies abound about science fiction scenarios. The Nazis were nothing if not methodical, and a deeper look reveals even darker plans. From tunnels to towers, artillery sites and communication centers; the remains of these schemes lie waiting to reveal truths about the Fuhrer's tactics and dreams in Secret Nazi Bases. What did Hitler have planned?