Kaboom Underground in Iran?

Powerline highlights this:

Reza Kahlili served the CIA Directorate of Operations as a spy in the Iranian Revolutionary Guard. He tells the story in A Time to Betray. Kahlili now asserts that an explosion at Iran’s underground nuclear facility at Fordo has destroyed much of the installation and trapped about 240 personnel deep underground, all “according to a former intelligence officer of the Islamic regime.” The explosion is said to have taken place on Monday. Israeli news stories — here and here — on Kahlili’s account rightly emphasize that the account remains uncorroborated by any source.

 Again, there has been no corroboration of this report.  But it should be noted that a certain someone predicted, well...

- Something Deep, Deep Underground in Iran Blows Up: Above-ground things are blowing up left and right and we are constantly told that the Big Bad Nuke Stuff is way underground where we can't bomb it. Well, maybe not with airplanes. We/they/whoever scores a big one with a KABOOM underneath the feet of the mullahs.

UPDATE:  Iran denies.