NOVA

Secret Tunnel Warfare

Passport Season 43 Episode 1 | 52m 52s

During World War I, the Allies and Germans repeatedly struggled to break the hideous stalemate of trench warfare. In the winter of 1916, Allied engineers devised a massive surprise attack: over 1 million pounds of explosives hidden in secret tunnels driven under German lines. Building the tunnels was desperate work, with tunnelers at constant risk from flooding, cave-ins, and enemy digging teams.

Aired: 01/06/16

Expires: 01/05/21

Rating: TV-PG

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