According to a Reuters report, Iran has deliberately destroyed several tunnels at its Isfahan nuclear facility using mines in recent weeks. In addition, explosive devices have allegedly been planted at entry points to the underground complex. Intelligence assessments suggest that nearly 90 percent of Iran’s enriched uranium stockpile is stored within underground tunnels beneath this facility, making it one of the most sensitive nuclear sites in the country.
Satellite imagery accessed by Reuters reportedly shows large-scale Iranian military activity around multiple tunnel entrances. Several access points have been sealed with soil and reinforced concrete. Experts argue that such measures are typically taken only when highly sensitive or strategically valuable materials are stored underground. The level of fortification has fueled speculation that enriched uranium or other critical nuclear materials may have been relocated or further secured.
Uranium enrichment is the process of increasing the concentration of the uranium-235 isotope through centrifuges. Enriched uranium between 3 to 5 percent is generally used for civilian nuclear power generation. Levels up to 20 percent are considered highly enriched but not weapons-grade. Uranium enriched up to 60 percent is regarded as near weapons-grade material, while 90 percent or higher is classified as weapons-grade and can be used in nuclear weapons production.
Iran’s nuclear program first came under global scrutiny in 2002 following revelations of secret enrichment activities at Natanz and heavy-water research at Arak. While Tehran has consistently maintained that its nuclear program is intended for peaceful energy purposes, the United States and several Western nations have long suspected weapons-related ambitions.
Reports, including assessments cited by Reuters, indicate that Iran possesses up to 450 kilograms of uranium enriched to 60 percent. Al Jazeera reporting suggests that nearly half of this stockpile may still be located at the Isfahan facility, while additional quantities are believed to be stored at Natanz and other underground sites.
Following these disclosures, the International Atomic Energy Agency launched inspections in 2003 and confirmed that Iran had been conducting long-term enrichment activities. In 2006, the United Nations imposed sanctions on Iran’s nuclear and ballistic missile programs, with support from China and later additional restrictions from the United States, significantly impacting Iran’s economy and international relations.
Amid escalating tensions, experts have warned that any potential United States ground operation aimed at securing enriched uranium would be extremely risky. Such an operation would require large-scale deployment of troops inside Iranian territory and could result in heavy casualties and prolonged military conflict.
Despite previous military strikes by the United States and Israel that reportedly damaged parts of Iran’s nuclear infrastructure, analysts believe the impact has been partial. A significant portion of highly enriched uranium is believed to remain intact, particularly in fortified underground facilities such as Isfahan and Natanz.
If Iran retains substantial quantities of highly enriched uranium, it could significantly reduce the time required to develop a nuclear weapon capability. However, Iran continues to insist that its nuclear activities remain strictly peaceful and compliant with international norms.
In the coming weeks, the International Atomic Energy Agency, along with the United States and Israel, is expected to maintain close surveillance of Iran’s underground nuclear facilities. Any further restriction on inspections or continued sealing of tunnels could further escalate geopolitical tensions in the region.
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