The US Airforce specs for the GBU-57, and the independent assessment from Jane's are that is able to penetrate about 60 m (200 ft) of earth or 18 m of concrete.
Fordow sits beneath a thick cap on a limestone–dolomite mountain, whose compressive strength rivals granite, and the facility is at least at 90 to 100 meters. If a warhead detonates the carbonate stack fractures and absorbs the pressure wave, calcite dissociation soaks up heat, keeping the cavern wall below all braking thresholds and leaving the target probably intact.
Fordow sits beneath a thick cap on a limestone–dolomite mountain, whose compressive strength rivals granite, and the facility is at least at 90 to 100 meters. If a warhead detonates the carbonate stack fractures and absorbs the pressure wave, calcite dissociation soaks up heat, keeping the cavern wall below all braking thresholds and leaving the target probably intact.
And they had hundreds of trucks in and out the days before the attack: https://www.cnbc.com/2025/06/22/satellite-images-show-activi...
Maybe Iran will not retaliate, not because the attack was successful but because it was not.
This one is probably the highest resolution, publicly available picture post attack. It's notable how the fence is still perfectly aligned...
https://static-cdn.toi-media.com/www/uploads/2025/06/AFP__20...