The first bunker-buster :

https://en.wikipedia.org/wiki/Disney_bomb

"According to an anecdote, the idea arose after a group of Royal Navy officers saw a similar, but fictional, bomb depicted in the 1943 Walt Disney animated propaganda film Victory Through Air Power,[Note 10] and the name Disney was consequently given to the weapon."

If they built the facility out of 30,000psi concrete, they'd be lucky to pen 4 meters with a direct hit, nevermind the 80m of limestone above it.