After all, as I have understood it, they not only have people on the ground at these locations but also have CCTV and even, on occasion, live feeds, to ensure there is no diversion of material and to monitor everything.
That being the case, you'd think they would have the scoop on a huge explosion and destruction of the facility.
Found this earlier which seems to back that up.
The U.N. nuclear agency is dismissing reports of a major explosion at Iran’s fortified underground nuclear facility.
International Atomic Energy Agency spokeswoman Gill Tudor told The Associated Press on Tuesday that Iran’s denial of “an incident” at the Fordo uranium enrichment plant is “consistent with our observations.” [...]
A diplomat familiar with the issue told AP that the IAEA’s information came directly from IAEA inspectors at Fordo.