Graphic detail | Bring out the big guns

America’s huge bunker-busting bomb is not sure to work in Iran

The Massive Ordnance Penetrator may struggle to wipe out the deepest nuclear facilities

Aiirmen look at a GBU-57, or Massive Ordnance Penetrator bomb, at Whiteman Air Base in Missouri, United States
Photograph: AP

ISRAELI AIR strikes have destroyed some buildings on the surface of Iran’s nuclear facilities, but the heart of the operation at sites such as the Fordow fuel-enrichment plant is still likely to be intact, hidden deep underground. Destroying this type of facility requires bunker-busting bombs more powerful than anything Israel can deliver. Donald Trump, America’s president, has indicated in recent days that he is coming around to the idea of helping. On June 17th he warned “our patience is wearing thin” with Iran. Reaching Iran’s bunkers will take a special kind of bomb: the US Air Force’s GBU-57 Massive Ordnance Penetrators (MOP).

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