Iran Ramps Up Underground Nuclear Site Construction Amid US Threats
Iran is significantly accelerating construction work at its underground nuclear facility known as "Mount Macou" (Har Ha'Mekhush), located in the Zagros Mountains near the Natanz facility. This site is considered one of the most sensitive in Tehran's nuclear program. Analysis of satellite imagery collected over six years by the Center for Strategic and International Studies (CSIS), as reported by CNN, reveals a substantial increase in building activities during 2026. These activities include reinforcing tunnel entrances, paving internal roads, strengthening access areas, and removing excavation debris.
Experts believe the underground facility is likely designed to be exceptionally deep and heavily fortified, potentially making it resistant even to bunker-busting munitions. This development occurs against the backdrop of recent threats from U.S. President Donald Trump to attack the site. Western reports suggest the facility could be used by Iran for uranium enrichment activities or for storing sensitive nuclear equipment.
The CSIS noted that satellite imagery alone cannot definitively determine the purpose of the construction. However, they emphasized that the pattern of activity indicates a transition from excavation to advanced reinforcement and internal construction phases, amid ongoing tensions surrounding Iran's nuclear program.
The same event, reported separately by each outlet. Open a few to compare what different newsrooms emphasize — and what they leave out.
Not the same event — other stories that share this one’s people, places, or theme: background, reactions, and follow-ups.
