>>508330171
Filling the tunnels blocks the path of the shockwave which in an enclosed space is going to be quite devastating.
Persians know their physics.
The mighty B2 flying niggercock achieved fuck all.

>>508321987
The holes are ventilation shafts. Congratulations mutts, all that you achieved is make a 5 meter hole in the top of a mountain. Most likely they didn't even use B2, they just launched cruise missiles from a safe distance.

>>508315273
they are ventilation shafts