Like being underground makes any difference. What do you think just happened with Russia's new weapon? This is nothing new, the US had these weapons and used them against Iraq over 30 years ago. Just to give you some math to think about. These weapons hit the target at 3000 meters a second, the weapons that the US used as bunker busters travel at 450 meters a second. At 3000 MPS would release over 40 times more kinetic energy than the equivalent weight at 450 meters a second. Yes the US weapons had much more weight to them and exploded at a depth at over 150 ft. These new weapons are different and not much is known about it. However the same pattern is happening again, Russian's are stupid, and this weapon is all bark and no bite. I think this weapon destroyed the underground factory completely. The Russians learned a few things in the last 30 years, and I can guess they improved such weapons by a huge amount.
View: https://www.youtube.com/watch?v=KJTq9yb_Zow
Bunker busters existed in WW2. That is how the Nazi Submarine Pens were destroyed.
They would reach supersonic speeds as they fell, burrowing into a target or the ground before exploding, with a thickened steel casing. The bombs were even able to destroy targets with a miss, as the shockwave travelling through the ground would subject the target to a localised earth quake, destroying it at its foundations.
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