Vietnamese veteran, Le Van Lang, remembers the war in the Viet Cong's underground tunnel network in South Vietnam. A resident of Cu Chi district, 20 km north of Saigon (now Ho Chi Minh City) he helped construct the tunnels and joined the insurgency against the South Vietnamese government and their American allies. The vast tunnel network became a key base and shelter for Viet Cong guerrillas and North Vietnamese units during the war,