Iran is aggressively pursuing the reconstruction of its nuclear infrastructure, rebuilding damaged subterranean facilities and hardened tunnel complexes despite previous military setbacks. The intensified activity has triggered renewed strategic planning among American and Israeli officials, who are weighing potential fresh military strikes and broader pressure campaigns to disrupt Tehran’s nuclear ambitions.
Previous military actions conducted by the United States and Israel in 2025 and 2026 successfully set the Iranian nuclear program back by more than two years and denied the regime a ready nuclear-weapons fuel source. Approximately 9,000 kilograms of enriched uranium—an amount sufficient to eventually produce roughly 22 weapons—remains entombed or otherwise inaccessible following those campaigns. However, the current pause has proven fragile as the Islamic Republic attempts to reconstitute its capabilities underground.
Satellite imagery analyzed by the Institute for Science and International Security revealed rapid rebuilding activity in September and October at Minzadehei, a facility dedicated to manufacturing key nuclear components that Israeli forces struck and nearly destroyed in March. A parallel reconstruction effort is underway at Taleghan 2, an above-ground bunker long linked by the International Atomic Energy Agency to high-explosive work and warhead experiments. Following strikes by Israel in October 2024 and March 2026, repair work resumed in June at Taleghan 2, where workers have capped penetration holes, added concrete blast protection, reinforced the structure, and concealed ongoing activity beneath tarps while construction equipment remains active.
Additional construction and activity have been identified at other key facilities. The Foreign Policy Research Institute reported new construction and the presence of shipping containers this week at Shahid Boroujerdi, a tunnel complex associated with past work on uranium metal for nuclear-weapon cores. Furthermore, Iran began repairing buildings in September at Malek Ashtar University, which was targeted by Israeli strikes earlier this year to halt nuclear-weaponization research.
At the deeply buried Pickaxe Mountain complex south of Natanz, satellite observations indicate that Iran has temporarily halted further excavation in favor of hardening the site to withstand future aerial bombardment, though work could resume at any time. Security analysts and military planners have flagged Pickaxe as a potential future enrichment and weaponization site, as well as a hiding place for uranium-enrichment centrifuges that survived the 2025 military strikes.
Discussions regarding potential military options include deploying the GBU-43/B Massive Ordnance Air Blast bomb, known as the MOAB, to block access to Pickaxe Mountain. While the 300-foot-deep tunnel complex may be beyond the reach of standard bunker-busters used previously at Fordow and Natanz, alternative munitions or tactical operations could restrict access and enable enhanced monitoring of the regime’s activities.
Strategic proposals extend beyond targeted airstrikes. Experts advocate for a sustained naval blockade and heightened economic pressure to constrain Tehran’s military budget, alongside covert operations aimed at dismantling scientific networks and procurement chains. Additional recommendations include developing next-generation bunker-busters capable of penetrating deeply buried installations, collaborating with Israel on subterranean drilling methods to collapse tunnel complexes from above, and maintaining defensive preparations to protect regional energy infrastructure against potential Iranian retaliation.
