Natanz
Natanz is Iran's primary uranium enrichment facility and a central pillar of its nuclear infrastructure. Located in central Iran, the site features both surface-level plants and deep underground enrichment halls designed to withstand aerial bombardment. Recent developments indicate a massive expansion into hardened subterranean facilities beneath nearby mountains.
Natanz serves as the cornerstone of the Islamic Republic of Iran's nuclear program. It is the country's largest uranium enrichment complex, housing thousands of centrifuges used to increase the concentration of the U-235 isotope. For Israel and the international community, Natanz represents the primary technical hurdle to an Iranian nuclear breakout, as the facility is capable of producing both low-enriched uranium for power and highly enriched uranium suitable for a nuclear weapon. The site is divided into the Fuel Enrichment Plant (FEP) and the Pilot Fuel Enrichment Plant (PFEP). Due to its strategic importance, Natanz has been the target of numerous reported sabotage operations and cyberattacks attributed to regional adversaries seeking to delay Tehran's nuclear progress. Recent developments in 2026 indicate a significant hardening of the site's operational security. Following the death of Supreme Leader Ali Khamenei, the Iranian regime has increasingly utilized Natanz as a tool for diplomatic leverage. In June 2026, Tehran officially barred International Atomic Energy Agency (IAEA) inspectors from the site, effectively creating a 'black box' regarding the current state of enrichment and centrifuge deployment. Furthermore, satellite imagery has identified extensive new construction at sites like 'Mount Makush' and 'Mount Pikakas' (Pickaxe Mountain) near the main complex. These facilities, buried 80-100 meters underground, are believed to be new, even more fortified enrichment halls designed to be immune to conventional bunker-buster munitions. Reports in September 2026 suggest that Iran has transferred thousands of centrifuges to these deep tunnels, potentially enabling the enrichment of its 60% uranium stockpile to weapons-grade. This activity has prompted direct military threats from the United States, with President Donald Trump signaling that the underground sites are primary targets for potential kinetic action.