US' B-2 Spirit Stealth Bomber strikes Iran's most powerful, impenetrable nuke facility, know its strength, cost is...; Why it should fear US' bunker-busting bomb GBU-57

US President Donald Trump ordered strikes on Iran's three nuclear sites of Fordo, Natanz and Isfahan on Sunday. Among these Fordo is the most important of the Iranian nuke facilities as it is uranium-rich and has long been a target of Israel.