The story of an extraordinary campaign in the Vietnam War - fought in a 200-mile labyrinth of underground tunnels and chambers.

The campaign in the tunnels of Cu Chi was fought with cunning and savagery between Viet Cong guerrillas and special teams of US infantrymen called 'Tunnel Rats'. The location: the 200-mile labyrinth of underground tunnels and secret chambers that the Viet Cong had dug around Saigon.

The Tunnel Rats were GIs of legendary skill and courage. Armed only with knives and pistols, they fought hand-to-hand against a cruel and ingenious enemy inside the booby-trapped blackness of the tunnels. For the Viet Cong the tunnel network became their battlefield, their barracks, their arms factories and their hospitals, as the ground above was pounded to dust by American shells and bombs.