These pitch-black tunnels were used as living quarters, hospitals, supply routes and storage during the war

Cu Chi tunnels are located about 20 miles outside of Ho Chi Minh City and during the Vietnam War, Viet Cong guerillas hid from the Americans inside the 200-mile long network. 

The pitch-black tunnels were used as living quarters, hospitals, supply routes and storage areas during the war.

The manhole-size entrances, hidden under fallen palm fronds, have today been widened for the tourists and can be explored in the state they were left between 1955 and 1975.