The Cu Chi Tunnels in Vietnam are a massive network of underground passageways that played a crucial role during the Vietnam War. Used by the Viet Cong fighters, these tunnels served as hiding spots, communication routes, hospitals, and living quarters. Life in the tunnels was tough, with soldiers facing scarcity of air, food, and water, along with creepy crawlies like snakes and spiders. Despite U.S. efforts to destroy the tunnels, they remained a thorn in their side, allowing the North Vietnamese fighters to outmaneuver and outlast their opponents. Today, the Cu Chi Tunnels are a popular tourist attraction where visitors can explore the historic site and learn about its significance in the war.