Nazi Mega Weapons: Season 2, Episode 6

2 - 6:

In 1938, shrouded in secrecy, the German Army starts work on fortifications to secure Germany’s western border with France. Designed to protect the Fatherland, the immense, deadly concrete belt of bunkers, anti-tank traps, minefields, gun emplacements and road blocks is five times the length of Hadrian's Wall.