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Bombing Iran's underground Fordo nuclear plant not guaranteed effective

1:13
U.S. Air Force
Bombing Iranian nuke plant with US bunker-buster bomb might not work: Expert
U.S. Air Force via AP, FILE
ByIvan Pereira
June 22, 2025, 2:04 AM

The U.S. attack on a key Iranian nuclear facility President Donald Trump ordered might not have been effective, even assuming American military's massive bunker-buster bombs were used

Speaking to the nation Saturday night called the strike a "spectacular military success," saying the sites were "completely and totally obliterated."

A national security expert familiar with Iran's program told ABC News earlier this week that while the 30,000-pound bombs have been tested, they've never actually been used and the exact nature of the concrete and metal protecting the site located deep inside a mountain -- that the bombs would need to penetrate -- isn't fully known.

Joe Cirincione, who has spent decades researching nuclear proliferation for Congress and other world leaders, said Thursday that while attacking Iran's nuclear enrichment program would cripple its nuclear weapons capability, it would not eliminate it.

Airmen look at a GBU-57, or the Massive Ordnance Penetrator bomb, at Whiteman Air Base in Missouri, May 2, 2023.
U.S. Air Force via AP, FILE

At the center of President Trump's decision to attack Iran is the Fordo nuclear enrichment facility in northwest Iran. It's believed to be built at least 300 feet deep inside a mountain -- maybe more -- and reinforced with concrete, according to experts.

The U.S. weapon touted as able to strike down inside the Fordo facility the GBU-57 A/B Massive Ordnance Penetrator bomb, known as a "bunker buster." It's capable of penetrating 200 feet deep inside an underground target and then exploding, experts say.

A B-2 Spirit returns to Whiteman Air Force Base, Missouri, from a deployment to Diego Garcia, British Indian Ocean Territory, May 9, 2025.
Senior Airman Devan Halstead/509th Bomb Wing/US Air Force

Cirincione said that using the untested weapon would not guarantee success.

"Fordo is not an easy target. They made this very difficult for the United States to destroy," he said. "Even [the bunker buster] can not penetrate 300 feet of mountain and reinforced concrete.

"You need to drop a bomb, that will dig a crater, and then another bomb in that crater and then another bomb, and then another," he said. "And then you will only damage that part of the facility."

In this Jan. 30, 2013, file photo, a satellite image of the Fordow facility is shown in Iran.
DigitalGlobe via Getty Images, FILE

Cirincione also noted that even if there's some damage done, Iran's government has the knowledge, experience and, most important, enough enriched uranium and centrifuges in other locationsto move forward with relative ease.

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MORE: The US bunker-buster bomb and how it could be used against Iran's nuclear program

"You can't bomb that," he told ABC News. "You can slow it down, but they can pick up and start again fast and they know it."

The International Atomic Energy Agency this week passed a resolution that stated Iran had breached its non-proliferation agreements and has been illegally stockpiling enriched uranium.

"I've been there, it's half a mile underground," Rafael Grossi, the IAEA's director general, said about the Fordo plant, as reported by The New York Times.

Days after the IAEA acted, Israeli forces attacked Iranian targets after Israeli Prime Minister Benjamin Netanyahu claimed the Iranian government could create a nuclear weapon "in a very short time."

Iranian officials have dismissed claims by Israel that they are building a nuclear weapon.

Related Articles

MORE: Israel-Iran live updates

White House spokeswoman Karoline Leavitt told reporters Thursday that the president would make a decision about attacking Iran "in two weeks."

Israel's Prime Minister Benjamin Netanyahu in Israel, June 13, 2025, President Donald Trump in Washington, June 18, 2025 and Iran's Supreme Leader Ayatollah Ali Khamenei in Tehran, June 13, 2025.
AFP via Getty Images/EPA-EFE/Shutterstock

Cirincione stressed that continued military strikes would not be a good option for Israel or the U.S. if the goal is an Iran without nuclear weapons.

"Once you recognize there is no military solution to this problem, the military solutions can only be threats to Iran and the only answer is to get Iran to agree to roll back and end its capabilities," he said.

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