Iran reportedly fortifies uranium stockpile sites with collapsed tunnels and mines
Iran has reportedly made access to part of its highly enriched uranium stockpile more difficult by collapsing tunnels and planting explosive mines around entrances at sites believed to hold the material. The development is said to centre on the Isfahan nuclear complex in central Iran, with additional quantities of uranium stored at other locations. It comes as the United States and Iran are said to be edging closer to an agreement aimed at ending months of conflict and addressing the future of Iran's enriched uranium.
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The report says the stockpile in question is roughly half a tonne of highly enriched uranium, material that experts consider close to weapons-grade. It cites five sources familiar with US intelligence and says much of the uranium is believed to be buried in collapsed tunnels at Isfahan. The reported fortifications would make any retrieval effort more difficult and dangerous, requiring excavation and de-mining operations before access could be restored.
The issue matters because the fate of Iran's enriched uranium has become one of the central elements in the proposed deal between Washington and Tehran. A senior US administration official said both sides had broadly agreed on a framework under which Iran would surrender its enriched uranium stockpile to the United States, where it would be destroyed on site before being removed from the country. Iranian officials, however, have indicated they prefer diluting the uranium rather than giving it up entirely, and Tehran has maintained that its nuclear programme is peaceful.
The reported changes at the storage sites add a further layer of complexity to an already sensitive negotiation. If the material is harder to reach, verifying any agreement could become more difficult for outside parties. That raises questions not only about the practical handling of the stockpile, but also about how compliance would be checked if a deal is reached.
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The Isfahan nuclear complex is already a focal point in the wider debate over Iran's nuclear programme. In this case, the reported use of collapsed tunnels and mines suggests a deliberate effort to control access to material that has major proliferation significance. Scott Roecker, who previously headed the US National Nuclear Security Administration's Office of Nuclear Material Removal, said the situation would definitely complicate retrieving the HEU.
What remains unclear is the exact condition of the stockpile, how much of it is affected, and whether the reported fortifications are permanent or temporary. It is also not clear how the proposed agreement would deal with material that may now be physically difficult to recover. The next key development will be whether Washington and Tehran can finalise terms that address both the uranium itself and the practical obstacles now surrounding it.
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