Pickaxe Mountain: the 100-Metre Target the US Says It Can Hit, and Cannot Yet Prove It Can

The number that matters most in this story is one hundred. Pickaxe Mountain — the Iranian nuclear-linked site President Donald Trump has vowed to bomb "pretty soon" — is estimated to lie almost one hundred metres inside a mountain of solid rock. ⁴ That is the depth every outlet writing about the facility converges on, give or take a few metres, and it is the depth that turns a presidential threat into an engineering problem. The site sits on the south side of the Natanz enrichment complex, in Isfahan province, dead-centre of Iran. ²⁹¹⁰ The US bombed the rest of Natanz during last year's 12-day war. Pickaxe Mountain was deliberately spared. ²⁹

Around July 21 and 22, 2026, Trump told reporters the United States would strike the site "pretty soon," and that he would do so "very heavily." ³⁸ Satellite imagery published in late June shows tunnel entrances being cut into the mountain, with construction still visibly underway. ²³ By early August, the BBC reported, Trump was still repeating the threat while fresh imagery showed the digging had not stopped. ⁶ As of the reporting on file, no strike has taken place. The threat is the event. ²⁹

Pickaxe Mountain's local name, Kuh-e Kolang Gaz La, is now almost an afterthought in Western coverage, swallowed by the English nickname. What matters is its function. Natanz was hit hard in 2025 during Operation Midnight Hammer, the US air campaign that ran alongside the Israeli war with Iran. The above-ground enrichment halls took the brunt of that attack. ²⁹ The Iranians' response was to dig down rather than rebuild up, and the mountain on the south side of the complex offered exactly the kind of cover conventional bombs struggle to defeat.

That is what makes the target so awkward. The reporting on file characterises the site as "under construction and buried deep below the ground." ⁸ Multiple outlets describe it as a tunnel complex, with imagery from Vantor and Planet Labs dated June 30 and June 15, 2026, respectively, showing new adits and spoil heaps. ²³ What is not in the sourcing is how far the Iranians have got toward installing equipment inside, or what the facility is actually meant to hold. Those questions remain open. ²⁹

Trump's public posture is total. The threat is not a conditional warning; it is a near-term promise to use force. ³⁸ Behind that posture sits a harder question that the open reporting does not resolve. The 100-metre figure for the site's depth is an estimate, not a surveyed measurement, and US public statements about the military's ability to defeat deeply buried targets are not accompanied in the file by the kind of primary-source detail — weapon name, modelled penetration depth, target intelligence — that would let an outside reader score the claim. ⁴

Iran, for its part, has framed any attack as escalatory. A spokesman cited by CNBC warned that a strike would be treated as "an explosion of war in the region." ⁵ Middle East Eye reports a similar warning from Tehran that bombing its nuclear infrastructure would widen the existing US–Israeli war. ¹⁰ The two governments are talking past each other in the open record, and the mountain sits in between.

The research file is unusually candid about its own limits. Several claims that have circulated in coverage of the threat — that the site is "not yet operational" according to the Institute for Science and International Security, that Israeli intelligence has assessed the relocation of thousands of centrifuges, that the Pentagon's GBU-57 Massive Ordnance Penetrator can defeat about 60 metres of reinforced earth, that 18 US service members have been killed and more than 440 wounded in the conflict, that the war has cost $37.5 billion so far against a $67 billion new request, that Defense Secretary Pete Hegseth told Congress the US can reach any target, and that Senator John Kennedy pushed back on that claim — are flagged in the file as not confirmable from the supplied primary sources. HeyDay is not in a position to repeat them as established fact, and the desk is not in a position to ignore them either, because they are part of how the story is being told in the wider press. The honest move is to name the gap and move on.

A facility built after a successful 2025 strike on the surface complex above it is, by design, a target the previous strike did not reach. Trump is now promising to bomb it, "pretty soon" and "very heavily." ³⁸ Iran is warning that any attack on the country's nuclear infrastructure will widen the war it says is already under way. ⁵¹⁰ The reporting on file confirms the threat, the location, the depth and the absence of any strike so far. ²³⁴⁶⁸⁹ Everything else — whether the US has a weapon that can reach 100 metres of rock, whether the target is even finished, what the diplomatic off-ramp looks like, and how the war's mounting costs would be affected by a strike on a hardened site — is, in the open record, still an open question. That is the story. Not whether Trump is threatening, but whether the threat resolves into something the documented arsenal can deliver against a target designed to defeat it.