Satellite Secrets: The Secret Stockpile of Iranian Uranium Revealed

Rafael Grossi, the Director General of the International Energy Agency, has alerted the international community that a significant portion of Iran’s highly enriched uranium is likely still located at the Isfahan nuclear technology center. In a recent interview, Grossi explained that satellite imagery confirms the presence of blue containers being moved into underground tunnels just prior to the outbreak of the 12 day war last year. Despite the Isfahan site being a primary target of U.S. and Israeli airstrikes during recent hostilities, the IAEA believes roughly 200 kilograms of uranium enriched to 60 percent purity remains sealed in these subterranean vaults, inaccessible to international inspectors.

The IAEA estimates that Iran’s total stockpile of 60 percent enriched uranium has reached over 440 kilograms, which is a very narrow technical step away from the 90 percent purity required for weapons grade material. Grossi noted that if Iran chose to fully weaponize this material, it would be enough to produce as many as ten nuclear bombs. Because inspections at Isfahan were halted when the conflict escalated in June 2025, the agency has been unable to verify if the physical seals placed on the material remain intact. Grossi expressed his hope that a political agreement could be reached to allow inspectors back into the site, but for now, the agency must rely on satellite data and intelligence estimates to track the status of the fuel.

The Trump administration has consistently maintained that denying Iran nuclear weapons capability is a core objective of U.S. foreign policy. While President Trump previously indicated that airstrikes had significantly hampered the Iranian program, the IAEA’s current assessment suggests that the core of the enriched material survived the bombardment due to the depth of the Isfahan tunnels. Discussions have reportedly taken place with Russia and other nations regarding the possibility of extracting the material from Iran or blending it down to reduce its enrichment level. However, such an operation would require a massive diplomatic shift or a high risk military intervention. Grossi emphasized that while there is an apparent interest from both Washington and Tehran to avoid further escalation, the lack of a formal agreement on the sequence of sanctions relief and nuclear curbs remains a major obstacle to a permanent ceasefire.