US bunker-buster strikes fail to destroy deep Iranian sites

The United States has deployed its most capable penetrating munitions, including B-2 Spirit stealth bombers delivering GBU-57 Massive Ordnance Penetrators, against Iran's underground infrastructure. Satellite imagery confirms extensive damage at facility entrances, including collapsed access tunnels and cratered ventilation shafts. However, US intelligence assessments reported by Ynet indicate the deep underground structures themselves have remained largely intact due to their hardened geology. More critically, Iran has demonstrated the ability to excavate blocked entrances and restore bunker access within hours of strikes, prompting US and Israeli forces to target heavy engineering equipment to slow the restoration process.