260ft is around 79m. The bombs can penetrate around 60m of concrete. So one bomb, probably not, but they are able to follow each other in quick succession meaning 2 or three should be able to do the job quite easily, with accurate GPS positioning.
The facility is beneath 80m of limestone which in the Qom formation is roughly equivalent to about 5000psi concrete.
Beneath the limestone, sits the facility itself which is encased in high performance concrete. So these bombs need to pen 80m of 5000psi material and then a unknown depth of high performance concrete.
And US military assets are often much more powerful than publicly advertised...
I know a bunch of armchair generals on here are speculating that this was ineffective, but time will tell.
Why do you believe that to be true?
Military: We can penetrate up to 200 feet with this new bunker buster bomb that we spent a billion dollars on…specifically for this site and some sites in North Korea.
Enemy: Build the bunker at 300 feet, I hear their best bunker buster is only effective to 200 feet.
Military: Damn, foiled again!
The land, roads, ingress points, elevators, security, everything around here is now FUBAR. Okay so you didn't "destroy the bunker", but how many years until it's functional again?
Not saying you're wrong, but... source?
And, if so, where was it moved to?