16MAY

Bunker-busters hit Isfahan depots

2 min read

12:41UTC

Heavy penetration munitions struck Iranian stores near Isfahan, with secondary explosions visible on video that Trump reshared.

← Back to Two Hormuz papers; Washington on neither Jump to analysis ↓

ConflictDeveloping

Key takeaway

Isfahan strikes destroyed ammunition stores but did not prevent Iran's same-day cluster warhead retaliation.

US forces dropped a high volume of 2,000-pound bunker-buster bombs on Iranian ammunition depots near Isfahan overnight on 30 to 31 March. ¹ Secondary explosions were confirmed on video. President Trump reportedly reshared the footage.

The strikes add to a campaign that had already exceeded 10,000 targets according to CENTCOM commander Admiral Brad Cooper five days earlier . Isfahan's depots hold conventional munitions that feed Iran's ballistic missile and drone operations. Destroying stockpiles degrades Iran's ability to sustain the current firing rate, but the third Bushehr strike within the reactor perimeter demonstrated that the air campaign has not altered Tehran's willingness to launch.

Iran's response came within hours. A ballistic missile carrying a cluster warhead struck three Israeli cities the same day. The sequence (bunker-busters, then retaliatory escalation with a new weapon type) mirrors a pattern established across multiple strike-retaliation cycles in this conflict. Each round introduces heavier ordnance on both sides.

Deep Analysis

In plain English

US planes dropped extremely heavy bombs, each weighing 2,000 pounds, on Iranian weapons storage sites near the city of Isfahan overnight. These 'bunker-busters' are designed to penetrate underground or reinforced structures before exploding. The secondary explosions visible on video confirmed ammunition was destroyed. But within hours, Iran fired a new type of missile at Israeli cities in retaliation. Destroying storage does not stop missiles already on their way. This strike-retaliation pattern has repeated multiple times throughout the war.

Deep Analysis

Root Causes

The Isfahan ammunition depots hold conventional munitions feeding Iran's ballistic missile and drone operations. Destroying stockpiles is a logical target within the stated objective of degrading Iran's military capacity, even after Hormuz reopening was privately abandoned as the primary goal.

The bunker-buster choice reflects intelligence that the depots were hardened or semi-underground. The 2,000-pound GBU-28 is the heaviest penetration munition in the US inventory. Deploying it at high volume signals that the target was assessed as both deeply protected and high-value. Secondary explosions confirm the assessment was correct.

Escalation

Each strike-retaliation cycle introduces heavier ordnance on both sides. The Isfahan bunker-busters prompted a cluster warhead within hours. At the current exchange rate, the next cycle could involve larger warheads or multiple simultaneous launches, especially if Israel's upper-tier defences are confirmed exhausted. The absence of any diplomatic off-ramp on the military track means the cycle has no natural stopping point.

What could happen next?

Consequence
Isfahan depot destruction degrades Iran's sustained firing rate but does not interrupt the current operational tempo within the same 24-hour window.
Immediate · 0.8
Risk
Each strike-retaliation cycle introduces heavier weapons on both sides, with the next Iranian response potentially targeting coalition bases directly.
Short term · 0.7
Consequence
Civilian casualty exposure in Iran rises as strikes extend into logistics infrastructure across population centres.
Short term · 0.75

Source Landscape

This story draws on centre-left-leaning sources from Israel

Israel

Primary parallel: Coalition strikes on Iraqi ammunition depots and missile sites in 2003 similarly degraded conventional capacity while failing to prevent sustained insurgent operations. Stockpile destruction succeeded tactically but did not alter the adversary's strategic willingness to continue.

Counter-parallel: The 1991 Gulf War's air campaign destroyed roughly 40% of Iraqi air defence in 72 hours, producing a genuine degradation of response capacity. The key difference is that Iran has demonstrated far greater ability to absorb strikes and continue firing than Iraq did in 1991.

Consensus view: IISS analysts note that destroying ammunition depots degrades the rate of fire but does not eliminate the capability. Iran's dispersed storage doctrine, adopted after the 2020 Soleimani assassination, means no single depot represents a strategic reserve.

Counter-view: Iranian military commentator Alireza Nader argues that the cluster warhead retaliation on the same day demonstrates Iran's operational resilience: the command to launch was given before the Isfahan depots were struck, not after. The sequence is coincidence, not evidence of reduced capability.

Key tension: Whether the cumulative effect of 10,000+ strikes across 32 days has meaningfully degraded Iran's launch tempo, or whether Tehran is conserving inventory for a decisive strike after Arrow-3 exhaustion.

Sources:Times of Israel

Mentions:Arrow-3 →Isfahan →CENTCOM (US Central Command) →

First Reported In

Update #53 · Trump drops Hormuz goal; toll becomes law

Times of Israel· 31 Mar 2026

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Causes and effects

Caused by

10,000 targets struck; 92% of navy gone

US bunker-buster strikes on Isfahan ammunition depots extend CENTCOM's campaign that already exceeded 10,000 declared targets.

Occurred 27 Mar 2026

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This Event

Bunker-busters hit Isfahan depots

The strikes extend CENTCOM's campaign past 10,000 declared targets and triggered Iran's cluster-warhead retaliation within hours.

Different Perspectives

India (BRICS meeting host, grey-market beneficiary)

New Delhi hosted the BRICS foreign ministers' meeting on 14 May that Araghchi attended under the Minab168 designation, giving India a front-row seat to Iran's diplomatic positioning. India's state refiners have been absorbing discounted Iranian crude through grey-market routing since April; Brent at $109.30 means every barrel sourced outside the formal market generates a structural saving.

Hengaw / Kurdish human rights monitors

Hengaw's daily reports from Iran's Kurdish provinces remain the sole independent cross-check on Iran's judicial activity during the conflict. Two executions across Qom and Karaj Central prisons on 15 May and five Kurdish detentions on 15-16 May indicate the wartime judicial pipeline is operating independently of military tempo.

Pakistan (mediator and bilateral partner)

Islamabad spent its diplomatic capital as the US-Iran MOU carrier to secure LNG passage for two Qatari vessels through a bilateral Pakistan-Iran agreement, spending its mediation credit for direct economic gain. China's public endorsement of Pakistan's mediatory role on 13 May is the structural reward.

China and BRICS bloc

Beijing endorsed Pakistan's mediatory role on 13 May, one day after the BRICS foreign ministers' meeting in New Delhi. Chinese state banks are processing PGSA yuan toll payments; China has not commented on its vessels' continued Hormuz passage, but benefits structurally from a non-dollar toll system it did not design.

Iraq (bilateral passage partner)

Baghdad negotiated a 2-million-barrel VLCC transit without paying PGSA yuan tolls, offering political alignment in lieu of cash. Iraq's position inside Iran's adjacent bloc makes it the natural first bilateral partner and a template for how Tehran structures passage deals with states that cannot afford Western coalition membership.

Bahrain and Qatar (Gulf signatories)

Both signed the Western coalition paper while hosting US Fifth Fleet and CENTCOM's Al Udeid base, respectively. Qatar occupies the sharpest contradiction: it is on coalition paper while simultaneously receiving LNG passage through the bilateral Iran-Pakistan track, a position Doha has tacitly accepted from both sides.