The Cu Chi Tunnels are 75 miles of interconnecting tunnels that were employed by the Vietnamese army in the Vietnamese War (or American War since they connect with it). They served as hiding spots and as routes for conversation and materials. Quite a few soldiers even lived in these tunnels https://saigon17159.estate-blog.com/27699409/helping-the-others-realize-the-advantages-of-sai-gon-list