Minor blurb from the article:
Satellite imagery shows that the entrances to Isfahan and Natanz were badly damaged by US airstrikes. US forces would likely need heavy machinery to dig through rubble in order to locate the enriched uranium, which is believed to be stored in tunnels buried deep underground - all while facing potential counterattacks from Iran.
"You've first got to excavate the site and detect [the enriched uranium] while likely being under near constant threat," Campbell said.
[0] https://www.bbc.com/news/articles/cvglv5v4yvpo