Our introduction to Cu Chi Tunnels begins by watching a propaganda type video on how the Vietnamese fighters including women and children where able to use simple tactics to overcome high tech US military attacks against them.
The first level for accommodation, the second level for bomb protection and a third level that provided a means of escape.
There were also booby traps made from bamboo built inside the tunnels. A simple but very well designed system that served its purpose well.
It is a tight squeeze for a two hundred pounder with broad shoulders.