Even after reading the text version, wondering how come these caves were not discovered before, especially after such a military focus on the region.
I'm confused because I have seen old episodes of Explorer and similar shows about them. I'm trying to figure out if it was the same chain of caves or not, but I remember a show dedicated to one cave system that had been turned into a massive fortress that the US basically had no choice but to ignore during the Vietnam war.
It's almost painful to see them drilling holes into the rock face. I understand the need but a part of me wants to get all greenpeace and kick the human invaders out.