Satellite Images Reveal Ongoing Construction at Iran’s Secret Nuclear Site Despite Agreement

New satellite images from late June 2026 reveal ongoing construction activity at Iran’s secret underground nuclear site known as "Mount Machoosh" in the Zagros Mountains, raising doubts about Tehran’s commitment to its nuclear agreement with the United States. The International Atomic Energy Agency (IAEA) inspectors have been denied access to this fortified site, which is not covered by the current memorandum of understanding that Iran signed with the U.S. under the Trump administration.

The Washington-based Institute for Science and International Security (ISIS) analyzed the images and noted continued vehicle movement and reinforcement of tunnel entrances, indicating active work that contradicts Iran’s pledge to maintain the status quo and halt construction at nuclear-related facilities. Spencer Faragasso, a senior ISIS fellow, described the ongoing work as a potential "insurance policy" for Iran should diplomatic negotiations fail, suggesting the site could soon host an advanced uranium enrichment facility.

Meanwhile, satellite photos show minimal activity at Iran’s three main nuclear sites, Natanz, Isfahan, and Fordow, where the U.S. conducted airstrikes last year under Operation "With the Lion." At Natanz, damaged access roads and entrances remain unrepaired, with only isolated vehicle presence. Isfahan shows no activity, with tunnel entrances still covered by earth. At Fordow, near the holy city of Qom, Iran has added passive defenses such as dirt and rock barriers along access roads, designed to slow vehicle movement rather than block it, while tunnel entrances remain covered.

These findings fuel concerns that Iran may be secretly advancing its nuclear capabilities at the Mount Machoosh site despite public assurances to the contrary. Experts argue that if Iran is serious about negotiations, it should demonstrate goodwill by halting construction at this sensitive location. The situation underscores ongoing tensions and mistrust surrounding Iran’s nuclear program and the fragile status of diplomatic efforts to curb it.