These tunnels served as living quarters, hospitals, supply routes, and command centers for the Viet Cong (VC). The tunnels also allowed them to launch surprise attacks and vanish without a trace.

Having already uncovered and blasted more than 500 Viet Cong tunnels in the Iron Triangle ... it contained French and U.S. maps, diagrams of the hotels and billets that house Americans in Saigon ...

During the Vietnam War the U.S. Army brass decides to create a special unit called the Tunnel Rats. Their main mission is to clean-up the Viet-Cong network of tunnels found in the Cu-Chi district ...