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Five hundred metres of granite. That is the distance between the deepest American bunker-buster and the Iranian missiles it cannot reach. The Yazd missile base, known as Imam Hossein, is carved into the Shirkuh mountain range in central Iran. The granite has a compressive strength of 25,000 to 40,000 pounds per square inch. Inside, automated rail systems move ballistic missiles through compartmentalised tunnels to multiple concealed launch exits, each sealed with blast doors and fitted with pressure-relief shafts that dissipate shockwaves from surface detonations. The facility has been struck at least five or six times since March 1. The entrances are cratered. The deep core is intact. Missiles are still launching from the mountain.
The United States and Israel have struck 77 percent of 107 sampled tunnel entrances across 32 bases. Nearly 29 of 30 known ballistic missile facilities have been targeted. The Khojir production complex near Tehran has had 88 structures destroyed. Overall missile production has halted. The daily launch rate has collapsed approximately 90 percent, from hundreds on the first day of the war to roughly 10 per day by late March. The campaign has been devastating by any conventional measure. And it has not been enough. Approximately 50 percent of Iran’s pre-war launcher fleet of 470 remains intact, buried in granite cores that surface ordnance cannot penetrate. An estimated 1,000 ballistic missiles capable of reaching Israel remain in underground storage. The fire rate is a fraction of what it was. The capability is not zero.
Iran built these cities over decades. The programme began after the Iran-Iraq War and accelerated in 2001 using tunnel-boring machines imported from Germany and expertise transferred from North Korea. The engineering borrowed from civilian dam construction: controlled blasting, reinforced compartmentalisation, automated transport rails. The IRGC calls them “missile cities.” There are an estimated 27 to 30 of them across the Zagros Mountains, the central desert ranges, and the islands of the Persian Gulf. Qeshm Island, positioned directly at the mouth of the Strait of Hormuz, houses an underground fortress with five layers of concrete and soil reinforcement. It has received only peripheral strikes on port infrastructure. Its deep missile tunnels, which directly threaten every vessel transiting the strait, remain operational.
While the United States bombs the entrances, China ships the fuel through the front door. At least four Iran-flagged vessels have departed the port of Gaolan in Zhuhai carrying sodium perchlorate, the precursor for solid rocket propellant, since the war began on February 28. The Telegraph, reviewing shipping data with expert analysis, reported the cargo is sufficient to manufacture propellant for hundreds of ballistic missiles. The Washington Post tracked two additional vessels, the Hamouna and the Shabdis, laden and departing in the first week of March. China denies knowledge of the end use. The vessels are flagged to Iran. The chemical is not ambiguous. Sodium perchlorate has one primary military application: it makes missiles fly.
The arithmetic is simple and unresolved. The United States can seal entrances. It cannot collapse 500 metres of granite from the air. Iran can launch from surviving exits. It cannot replace destroyed production facilities without Chinese precursors arriving by sea. China can ship the fuel. It cannot guarantee the missiles hit their targets. And Israel can intercept most of what launches. It cannot intercept all of it. A ballistic missile struck a residential building in Haifa on April 5, killing two people. It was not intercepted. It came from a mountain that has been bombed six times.
The war underground is the war the air campaign cannot finish. The granite remembers what the bombs forget.
