In recent days, multiple satellite photo providers have put out pictures of the latest Iranian efforts to conceal the status of their nuclear program rebuilding efforts at Natanz, Isfahan, and Parchin-Taleghan 2.
All of these developments come as US President Donald Trump has been weighing a major strike against Iran on a day-to-day basis.
Parchin-Taleghan 2 has previously served as an AMAD (1990s-2000s) era nuclear weapons group site relating to explosives testing and is just south of Tehran.
Prior to the Israel-Iran war of June 2025, Natanz was Iran's largest site for enriching uranium, containing the vast majority of its centrifuges, situated around 220 kilometers (135 miles) south of the capital.
It was a mix of above and below-ground facilities.
Before June 2025, Isfahan was a series of Iranian above and below-ground nuclear sites for weaponization, including producing uranium metal, and also known for producing the uranium gas which would be fed into centrifuges as part of the enrichment process at Natanz, and another nuclear facility at Fordow.
It is located around 350 kilometers (215 miles) south of Tehran.
Besides June 2025, Israel also struck around 20 targets in Iran in October 2024 in retaliation for a massive ballistic missile attack.
Following the October 2024 attack, an Institute for Science and International Security (the "good" ISIS) report published by its President, David Albright, said that satellite photos showed that the Islamic Republic had started new construction at Taleghan-2, including a roof to conceal its activities.
This rebuilding continued after the wider June 2025 Israeli attacks on Iranian nuclear facilities.
More recently, Tehran started constructing roofs to conceal developments at some of the Natanz and Isfahan nuclear facilities as well.
Satellite photos from the Institute for Science and International Security (which refer to themselves as the "good ISIS") and from Planet Labs PBC (first published by the Associated Press) show additional construction even in late January, even as the situation has heated up about a potential US strike on Iran.
Photos have also shown various openings to Isfahan's underground facilities being covered or otherwise filled up, with nuclear experts suggesting that these are moves to protect nuclear assets below ground from a potential future American strike.
Iran undertook similar measures prior to Israel's June 2025 strikes.
Analysts do not know what activities Iran is undertaking beneath the new roofs, but speculation is that Tehran is not trying to move nuclear assets out to other areas, but possibly moving assets around within those areas or bringing assets from other locations to those better protected underground areas.
Some of the facilities look similar to facilities at the Karaj nuclear site, which had been used to produce parts for the nuclear enrichment process.
Iran possesses large amount of 60% enriched uranium
Iran already has around 400 kilograms of 60% enriched uranium, so analysts have speculated its next priority is to reestablish even a small centrifuge enrichment fleet, which could be used to weaponize some of that uranium.
Experts have said that a much smaller number of centrifuges than Iran's prior immense 20,000 fleet of machines would be sufficient to weaponize uranium, which is already up to 60%.
At the same time, IDF sources do not believe that Iran has made any serious efforts to start the re-enrichment process, concerned about how deeply its apparatus was penetrated by Israeli intelligence in June 2025.
Isfahan by itself was struck by Israel in June 2025 at seven different locations, and by the US at three separate locations, while Natanz was also hit several times by the two countries.