Iran has built a large security perimeter around two deep tunnel complexes near its Natanz nuclear facility, according to a satellite imagery released by the Institute for Science and International Security (ISIS).
“New satellite imagery shows Iran is constructing a new, large security perimeter around the base of Mt. Kolang Gaz La, an area housing a new, large tunnel complex, and a smaller one dating to 2007, located south of the Natanz enrichment complex,” the Washington-based think tank said.
NEW SATELLITE IMAGERY shows Iran is constructing a new, large security perimeter around the base of Mt. Kolang Gaz La, an area housing a new, large tunnel complex, and a smaller one dating to 2007, located south of the Natanz enrichment complex. This increases the concern that… pic.twitter.com/C92bWuSwb7
— Inst for Science (@TheGoodISIS) April 23, 2025
David Albright, president of ISIS, said the new perimeter suggests the tunnel complexes could soon be operational. He warned the sites may be used to store highly enriched uranium, undeclared nuclear material, or advanced centrifuges.
According to reports, Iran has not allowed United Nations inspectors to access the tunnels.
Rafael Grossi, head of the UN’s nuclear watchdog, the International Atomic Energy Agency, (IAEA) said they have asked Iran to provide an explanation on the recent developments.
“We’re asking them, what is this for? They’re telling us, it’s none of your business,” Grossi told reporters in Washington. He noted that the tunnels could potentially house undeclared materials, though he refrained from speculating further.
Grossi also mentioned that Iranian and IAEA experts would hold follow-up meetings on the matter, including discussions on reinstalling surveillance cameras at nuclear sites.
This development comes as the U.S. and Iran prepare for a third round of nuclear talks aimed at restoring limits on Iran’s uranium enrichment. President Donald Trump, who withdrew from the 2015 nuclear deal in 2018, has warned of military action unless Iran agrees to new restrictions.
Since the U.S. exit from the deal, Iran has exceeded limits on uranium enrichment. Western governments suspect Iran is trying to develop nuclear weapons. Iran denies this and insists its program is for peaceful purposes.
