Prove it.
Morning. I’ve said it before and cannot believe no one has thought of it before.
You do not have to penetrate hundreds of feet of rock - you just hammer the entrances ... repeatedly. A 24/7 satellite or drone would be useful.
Keywords for the gubmint: Nuclear, Iran, underground, enrichment, bomb, Israel, bunker buster, centrifuge, secret, weapons grade, etc.
;-)