What is the Massive Ordnance Penetrator, the U.S. bunker-busting bomb?: Iran’s hardened, underground nuclear sites are impervious to most conventional weapons — except perhaps the U.S.-made 30,000-pound, deep-penetrating bomb.

https://www.washingtonpost.com/national-security/2025/06/17/massive-ordnance-penetrator-iran-bunker-buster/