The tunnels of Cu Chi are an immense network of connecting underground tunnels located in the Cu Chi district of Ho Chi Minh City (Saigon), Vietnam, and are 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, and were the Viet Cong's base of operations for the Tet Offensive in 1968.

The tunnels were used by Viet Cong guerrillas as hiding spots during combat, as well as serving as communication and supply routes, hospitals, food and weapon caches and living quarters for numerous guerrilla fighters. The role of the tunnel systems should not be underestimated in its importance to the Viet Cong in resisting American operations and protracting the war, eventually persuading the weary Americans into withdrawal. They choose this area because the soil was hard enough to support the bomb and the weight of tanks and soft enough to dig long tunnels to escape to the Mekong river.

The tunnels of Cu Chi did not go completely unnoticed by U.S. officials. They recognized the advantages that the Viet Cong held with the tunnels, and accordingly launched several major campaigns to search out and destroy the tunnel system. Among the most important of these were Operation Crimp and Operation Cedar Falls.
Operation Crimp began on January 7, 1966, with B-52 bombers dropping 30-ton loads of high explosive onto the region of Cu Chi, effectively turning the once lush jungle into a pockmarked moonscape. 8000 American soldiers were sent to stop this strategic point.
The operation was, for the most part, unsuccessful. On the occasion when troops found a tunnel, they would often underestimate its size. Rarely would anyone be sent in to search the tunnels, as it was so hazardous. The tunnels were often rigged with explosive booby traps or punji stake pits. The two main responses in dealing with a tunnel opening were to flush the entrance with gas or water to force the guerillas into the open, or to toss a few grenades down the hole and “crimp” off the opening. The clever design of the tunnels along with the strategic use of trap doors and air filtration systems rendered American technology ineffective.
From its mistakes, U.S. command realized that they needed a new way to approach the dilemma of the tunnels. They began training an elite group of volunteers armed only with a gun, a knife, a flashlight and a piece of string in the art of tunnel warfare. These specialists, commonly known as “tunnel rats” would enter a tunnel by themselves and travel inch-by-inch cautiously looking ahead for booby traps.
Despite this revamped effort at fighting the enemy on its own terms, U.S. operations remained largely unsuccessful at eliminating the existence of the tunnels. In 1967, General William Westmoreland tried launching a larger assault on Cu Chi and the Iron Triangle. Called Operation Cedar Falls, it was, in principle, exactly the same as Operation Crimp, but with 30,000 troops instead of the 8,000.

On January 18th, tunnel rats from the 1st and 5th Infantry uncovered the Viet Cong district headquarters of Cu Chi containing half a million documents concerning all types of military strategy. Among the documents were maps of U.S. bases, detailed accounts of PLAF movement from Cambodia into Vietnam, lists of political sympathizers, and even plans for a failed assassination attempt on Robert McNamara. With this one exception, Operation Cedar Falls failed to achieve its objective of destroying the communist stronghold in the region.
By 1969, B-52s were freed from bombing North Vietnam and started "carpet bombing" Cu Chi and the rest of the Iron Triangle. Ultimately it proved successful but futile. Towards the end of the war, the tunnels were so heavily bombed that some portions actually caved in and other sections were exposed. But by that time, they had succeeded in protecting the local guerrilla units in "surviving to fight another day".
Throughout the course of the war, the tunnels in and around Cu Chi proved to be a source of frustration for the U.S. military in Saigon. The Viet Cong had been so well entrenched in the area by 1965 that they were in the unique position of locally being able to control where and when battles would take place. By helping to covertly move supplies and house troops, the tunnels of Cu Chi allowed guerrilla fighters in their area of South Vietnam to survive and help prolong the war and increase American costs and casualties until their eventual withdrawal in 1975.


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