Iran’s latest subterranean nuclear site likely impenetrable to US bunker busters

Iran’s latest subterranean nuclear site likely impenetrable to US bunker busters

Jon Gambrell

Near a peak of the Zagros Mountains in central Iran, workers are building a nuclear facility so deep in the earth that it is likely beyond the range of a last-ditch US weapon designed to destroy such sites, according to experts and satellite imagery analyzed by The Associated Press.

The photos and videos from Planet Labs PBC show Iran has been digging tunnels in the mountain near the Natanz nuclear site, which has come under repeated sabotage attacks amid Tehran’s standoff with the West over its atomic program.

With Iran now producing uranium close to weapons-grade levels after the collapse of its nuclear deal with world powers, the installation complicates the West’s efforts to halt Tehran from potentially developing an atomic bomb as diplomacy over its nuclear program remains stalled.

Completion of such a facility “would be a nightmare scenario that risks igniting a new escalatory spiral,” warned Kelsey Davenport, the director of nonproliferation policy at the Washington-based Arms Control Association. “Given how close Iran is to a bomb, it has very little room to ratchet up its program without tripping US and Israeli red lines. So at this point, any further escalation increases the risk of conflict.”

The construction at the Natanz site comes five years after then-US president Donald Trump unilaterally withdrew America from the nuclear accord. Trump argued the deal did not address Tehran’s ballistic missile program, nor its support of militias across the wider Middle East.

But what it did do was strictly limit Iran’s enrichment of uranium to 3.67% purity, powerful enough only to power civilian power stations, and keep its stockpile to just some 300 kilograms (660 pounds).

Since the demise of the nuclear accord, Iran has said it is enriching uranium up to 60%, though inspectors recently discovered the country had produced uranium particles that were 83.7% pure. That is just a short step from reaching the 90% threshold of weapons-grade uranium.

As of February, international inspectors estimated Iran’s stockpile was over 10 times what it was under the Obama-era deal, with enough enriched uranium to allow Tehran to make “several” nuclear bombs, according to the head of the International Atomic Energy Agency.

Iran says the new construction will replace an above-ground centrifuge manufacturing center at Natanz struck by an explosion and fire in July 2020. Tehran blamed the incident on Israel, long suspected of running sabotage campaigns against its program.

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