Only 12 bombs targeted the underground uranium enrichment facility at Fordo in northern Iran. Video segments filmed at the attack site revealed enormous explosions and fire trails ascending skyward, while the United States promptly announced a successful operation.
Attacking the subterranean installation, entombed tens of meters deep within solid mountain rock, demanded specialized ordnance that the US Air Force lacked until slightly more than ten years ago. Penetrating the reinforced complex necessitated GBU-57A/B MOP bombs, precision-guided munitions weighing 30,000 pounds, engineered to engage fortified structures buried far below ground level.
The MOP emerged from an extensive lineage of "bunker-penetrating" weapons developed by American forces throughout the Cold War era. These constitute precision armaments featuring independent guidance systems, incorporating multiple operational phases enabling penetration through concrete barriers, soil, and stone.
The MOP's defining characteristic centers on the weapon's massive scale. Each individual bomb weighs 30,000 pounds, establishing it as the heaviest munition within the US Air Force inventory. Only one aircraft type currently in active service possesses the capability to transport it with suitable deployment mechanisms – the B-2 "Spirit" bomber, a stealth aircraft developed during Cold War tensions. While B-52 aircraft transported the weapon during experimental phases, they received no operational modifications for combat deployment.
The weapon's development faced significant obstacles, particularly the technical complexity of installing an effective fuse enabling detonation upon target impact. Consequently, during certain testing scenarios, the bomb penetrated through targets while drilling into terrain, detonating only after reaching complete cessation of movement. The resolution to this issue remains classified, though the problem persisted even following the bomb's operational introduction in 2011. Nevertheless, despite technical challenges, the MOP stands as the world's singular weapon system capable of engaging fortified installations at substantial depths below surface level.
