The Cu Chi tunnel system is about 30km south of HCMC in the district of Cu Chi. This underground system of tunnels and rooms allowed the Viet Cong control over much of the area; within this one district an estimated 200 kilometers of tunnels provided security, of sorts, to the Viet Cong. The system included: hospitals, mess facilities, sleeping quarters and various other places from which the VC could continue operations against the American forces, including infiltrating Saigon. The entrance to the tunnel system might be a simple hole in the ground with leaves scattered over the top, almost impossible to find. American forces attempted to infiltrate the system using dogs and other means e.g. burning the forest down and searching for footprints in the ashes. Infiltrating the tunnels resulted in high casualties due to various
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