Secret Tunnel Warfare


Episode Info

Recalling an Allied tunneling operation beneath German lines in France during World War I, when some 600 tons of explosives were placed in the secret tunnels and simultaneously triggered. The resulting explosion was heard 150 miles away in London; and killed 10,000 German soldiers. Archaeologists and bomb disposal experts clear topsoil packed with shrapnel and unexploded shells; and probe a tunnel connected to a 22-ton bomb that didn't detonate after the chamber was flooded by German engineers.