PBS VS UTC PBS VS UTC - 28/06/2026 20:30

[SiK]

all soldiers and civilians had to dig 1meter a day…and they make the big ones in 3 months ..that is the underground parts

..not counting the trenches on top/near the compounds.

interesting part: look at the shape of the tunnels….this is made that way to withstand the bomb-explosions better.

a tunnel 20meter underground was able to take b52 bombs direct hit…. 70% of Vietnam soil is Red clay…great for this kind of structures.