Early US Intel assessment suggests strikes on Iran did not destroy nuclear sites

You don’t need to be a genius to figure out that centrifuges installed 70–80 meters underground will be largely unaffected by bombs which are believed to have an effect down to a depth of 60 meters.

Moreover, I read the wiki ( https://en.m.wikipedia.org/wiki/GBU-57A/B_MOP ) that 60m penetration specification is for ~35MPA concrete. And good basalt rocks easily go 100MPA. So if Iranians choose just good Mountain, and there are plenty of them...... Mother earth is really strong some places.

That's probably why they targeted the air duct system. It's already been cut and provides a blast channel.