History's Raiders S01 E23 The Tunnel Raiders1914-1918

As World War 1 degenerated into the gruelling stalemate of trench warfare, both sides sought desperately for ways of breaking through the enemy's lines. One of the most extraordinary methods was to tunnel under the enemy's positions and set off massive explosions to create a breach. Soon a bizarre new form of warfare had begun as underground raids were mounted against the enemy's mines.