I'm quite interested to see how effective these GBU-57s were. It's been the big question for a long time now. In the 2003 Iraq war, bunker busters had poor penetration, far worse than the US claimed. They put a lot of research and money into the GBU-57s. It is claimed they can penetrate 60m of dirt, and Fordow is more than 80m deep. But they can possibly stack them with precise targetting. But that is dirt. With 69 Mpa concrete they only penetrate 8 meters. And concrete shaped in angles can "steer" these so they turn sideways and don't go as deep. So I'm still skeptical that these GBU-57s penetrated into Fordo's interior. But I suspect we will find out. Maybe the US did penetrate all they way in with tactical nukes and is not admitting that is what was used. Or maybe they used what they claimed, and didn't get all the way in. Either of those two seems more likely to me. But I'm just a computer guy. I dunno anything really.