Iran is reinforcing an underground tunnel network designed to store enriched uranium and centrifuges, according to a report by the Institute for Science and International Security.
Satellite images show increased fortifications around Mount Kolang Gaz La, south of the Natanz facility, signaling preparations against potential attacks.
“The creation of a security perimeter around deeply buried sites associated with uranium enrichment suggests that Iran is increasingly worried about an individual or group seeking to enter the tunnel complexes undetected,” the report noted.
The complex, when complete, may house new centrifuges to replace those destroyed at Natanz in 2020. The facility will reportedly be deeper than Fordow’s, further shielding it from possible strikes. Neither site is currently inspected by the International Atomic Energy Agency.
The development comes as the U.S. and Iran prepare for renewed nuclear talks in Oman. Despite negotiations, Iran insists it will not dismantle its program—drawing threats from President Trump, who warned of military action involving Israel.