https://www.cbsnews.com/news/massive-ordnance-penetrator-bomb-gbu-57-b-2-bomber-iran-fordo-nuclear-facility/
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One of the key attributes of the B-2 Spirit is its stealth — it's able to evade air defenses and reach heavily defended targets. It's aerodynamically efficient and its internal weapons bays can carry two of the GBU-57 bombs...'
Because of the GBU-57's weight — it's the heaviest bomb produced by the U.S. — the B-2 Spirit is currently the only aircraft in the Air Force that is equipped to carry and deploy