The tunnels of Cu Chi are an immense network of connecting underground tunnels located in the Cu Chi district of Vietnam.

They are actually a part of a much larger network of tunnels that underlie much of the country.

The Cu Chi tunnels were the location of several military campaigns during the Vietnam War.

During combat the tunnels were used by NLF guerrillas as hiding spots, as well as serving as communication and supply routes, hospitals, food and weapon caches and living quarters for numerous guerrilla fighters.

Had it not been for these tunnels the NLF would not have been able to resist American operations for so long forcing them to withdraw.