the Cu Chi tunnels Is not only to provid underground shelter, But also served a key role during combat operations, including as a base for Communist attacks against nearby Saigon.
The tunnels were dug with simple tools and bare hands during the French occupation in the 1940s, and further expanded during the Vietnam War in the 1960s to provide refuge and a defensive advantage over the American soldiers.
links:https://www.butterfield.com/blog/2014/09/18/army-underground-cu-chi-tunnels/
https://www.history.com/topics/vietnam-war/cu-chi-tunnels
Elliot Meyer says
Wow! I can’t imagine having to hide from coming attacks, especially underground. The bravery this people had to show to endure things like this is unimaginable. Digging these tunnels by hand would have been incredibly strenuous work. Your posted picture helps us get an idea of how much thought would have to be given to this: trapdoors, two entrances/exits, and hiding places. How incredible!