GBU-72 Bunker-Busters Slam Iran Missile City — Hajiabad Tunnel Entrances Destroyed but Underground Silos Still Operational
Heavy penetrator bombs used in southern Iran strike campaign highlight the difficulty of destroying underground missile bases built into mountains near the Strait of Hormuz.
(DEFENCE SECURITY ASIA) — The confirmed use of heavy penetrator munitions against Iran’s Hajiabad underground missile base in Hormozgan Province signals a calculated escalation in the ongoing US-Israel strike campaign, with the operational objective focused on sealing tunnel access points rather than destroying hardened launch infrastructure deep inside the mountain complex.
Open-source analysis by OSINT observer Pataramesh indicating the possible employment of GBU-72 5,000-lb advanced penetrator bombs alongside BLU-109 JDAM warheads underscores a deliberate bunker-buster strategy designed to deny Iran access to stored ballistic missiles without risking the uncertainty of deeper structural penetration inside fortified underground missile-city networks.
Satellite imagery, strike footage, and damage assessments collectively suggest that the attack targeted entrances, surface buildings, and mobile launcher positions, reinforcing the strategic assumption that Iran’s underground missile complexes remain difficult to neutralize once construction reaches hardened vertical silo depth within mountainous terrain.
Repeated precision strikes against access portals rather than direct silo penetration indicate a force-posture decision prioritising operational suppression of launch capability over total structural destruction, reflecting the constraints faced when attacking deeply buried missile infrastructure engineered specifically to survive conventional air-delivered bunker-buster munitions.
The choice of penetrator ordnance consistent with GBU-72 and BLU-109 profiles suggests the strike planners assessed that sealing tunnel networks could produce faster degradation of Iran’s ballistic-missile readiness cycle than attempting full collapse of reinforced underground chambers protected by thick rock overburden.
Damage signatures visible in satellite imagery and strike footage imply a sequential targeting doctrine intended to create cumulative erosion around tunnel entrances, increasing the logistics burden on Iranian engineering units tasked with clearing debris before any missile launch operations can resume.
The emphasis on destroying mobile launchers and surface support structures near tunnel exits further indicates that exposed deployment phases remain the most vulnerable moment in Iran’s missile-city concept, forcing reliance on underground survivability while reducing immediate launch flexibility.
Taken together, the strike pattern supports the assessment that the campaign is designed to impose sustained operational friction on Iran’s missile forces in the Hormozgan theatre, limiting launch tempo through access denial while leaving the deeper silo network as a persistent but temporarily constrained strategic threat.
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Strike Pattern Focused on Tunnel Entrances Rather Than Silos
Repeated precision impacts recorded on bomb-camera and ISR footage show targeting boxes fixed on tunnel portals carved into rocky slopes, followed by sequential detonations producing large dust plumes and debris clouds consistent with deep-penetration impacts intended to collapse access points rather than destroy internal chambers.
The visible erosion and structural collapse around entrance areas indicates that the strike plan prioritized blocking logistical access routes, a method intended to immobilize stored missiles and launch equipment inside the underground network rather than attempting high-risk direct penetration of hardened launch pits.
Imagery analysis confirms crater formation, scattered rockfall, and debris piles surrounding tunnel openings, with damage patterns suggesting that multiple penetrator impacts were required to achieve sufficient structural degradation to complicate clearing operations.
Surface support infrastructure near the entrances, including buildings and access roads used for mobile launcher deployment, was also struck, indicating a combined objective of isolating the underground facility while simultaneously destroying equipment operating outside the tunnels.
Early March imagery shows at least three mobile medium-range ballistic missile launchers destroyed near entrance zones, supporting the assessment that surface-level assets remain the most vulnerable element of Iran’s missile-city concept once exposed.
Analysts note that targeting entrances rather than silos allows repeated re-strikes to maintain denial of access without requiring the extreme penetration depth needed to destroy reinforced underground launch pits.
The sequential strike pattern visible in footage suggests coordinated guidance updates between impacts, consistent with precision JDAM-guided bunker-buster employment rather than unguided bombing runs.
This approach aligns with broader strike activity across southern Iranian underground facilities, where multiple sites have reportedly been attacked using similar entrance-sealing tactics rather than deep bunker destruction.
The method reflects the operational reality that underground missile-city networks are designed specifically to survive direct strikes, forcing attackers to target access points, logistics routes, and exposed launch systems instead.
Hajiabad Missile City Structure Designed for Underground Launch Capability
The Hajiabad missile base is identified as an IRGC Aerospace Force underground installation located roughly 130 kilometres north of Bandar Abbas, built into mountainous terrain to provide natural protection against air and missile strikes.
Construction activity at the site reportedly accelerated between 2016 and 2020, during which multiple tunnel entrances, vertical launch pits, support facilities, and mobile launcher roads were developed to support sustained ballistic missile operations.
At least seven hardened vertical launch silos or pits have been documented at the base, some designed to allow missiles to be fired directly from underground positions without requiring exposure at surface level.
This underground-launch capability represents a key feature of Iran’s missile-city doctrine, allowing weapons to remain protected from surveillance until the moment of firing.
The tunnel network connecting launch pits, storage chambers, and support areas is believed to enable rapid relocation of missiles within the complex, complicating targeting by external forces.
Mountain-carved entrances provide both concealment and structural protection, making the collapse of access points one of the few viable ways to temporarily neutralize the facility without penetrating deeply buried launch infrastructure.
Support buildings and road networks near the entrances are required for mobile launcher operations, creating predictable vulnerability zones that can be targeted even when underground areas remain intact.
The combination of hardened silos and mobile launch capability means that complete destruction of the base would require multiple layers of penetration and repeated strikes over time.
Damage assessments therefore focus not only on structural destruction but also on the ability of Iran to clear debris and restore access to the underground network.
Evidence Suggests Penetrator Bomb Use Including GBU-72 and BLU-109
OSINT reporting citing strike patterns and crater signatures suggests the use of penetrator bombs possibly including the GBU-72 advanced bunker-buster and BLU-109 warheads fitted with JDAM guidance kits.
The GBU-72, a 5,000-lb class penetrator designed for hardened targets, is believed to have seen operational use in recent strikes, marking a significant escalation in the type of ordnance deployed against underground facilities.
The BLU-109, a 2,000-lb penetrator warhead commonly used with JDAM guidance, provides precision capability against reinforced concrete and rock-covered structures such as tunnel entrances.
Impact footage showing deep flashes followed by delayed debris clouds is consistent with penetration before detonation, a characteristic signature of bunker-buster employment.
Repeated strikes on the same entrance areas suggest that multiple penetrators were used sequentially to achieve sufficient collapse in rocky terrain.
Such targeting indicates an effort to create erosion and rockfall inside tunnel mouths, making clearance slow and dangerous rather than attempting immediate destruction of the entire facility.
Reports linking the strikes to heavy bomber operations, including the possible use of aircraft capable of carrying bunker-buster munitions, support the assessment that the operation was planned for hardened underground targets.
The precision of the impacts also suggests guided weapons rather than unguided bombs, reinforcing the view that the campaign aims at controlled structural denial rather than indiscriminate destruction.
Analysts note that this type of strike profile is typical when attacking deeply buried military infrastructure that cannot easily be destroyed with a single impact.
Satellite Damage Assessment Shows Surface Destruction but Intact Launch Pits
Post-strike satellite imagery indicates extensive damage to entrance zones, support structures, and surface equipment, while the hardened vertical launch pits show no confirmed direct hits.
Crater patterns around tunnel portals and debris piles blocking access routes support the assessment that the primary goal was to seal the underground complex rather than destroy it completely.
Destroyed buildings and damaged roads near the entrances indicate that surface logistics capability has been temporarily degraded.
Imagery showing destroyed mobile missile launchers near entrance areas reinforces the conclusion that exposed launch assets remain the easiest targets during missile-city operations.
However, the absence of visible damage to the vertical launch pits suggests that the deepest parts of the base remain structurally intact.
This means that the facility could potentially resume operations if debris is cleared and access routes are restored.
Analysts therefore describe the strike as reducing short-term effectiveness rather than eliminating the base entirely.
Satellite comparisons taken before and after the strike show consistent patterns of entrance scarring and surface damage across multiple underground sites in southern Iran.
These findings support the broader conclusion that missile-city networks are difficult to destroy outright but can be temporarily suppressed through repeated access-denial strikes.
Campaign Strategy Aims to Trap Missiles Underground Rather Than Destroy Them
Reports describing waves of strikes on southern Iranian underground facilities indicate a consistent operational approach focused on sealing entrances to trap weapons inside rather than attempting full structural collapse.
The strategy reflects the difficulty of penetrating deeply buried missile-city installations built into mountains and reinforced to withstand conventional bombing.
By targeting entrances and mobile launch zones, attackers can prevent missiles from being deployed even if the storage chambers remain intact.
This approach also reduces the number of bunker-buster weapons required compared to attempts to destroy entire underground networks.
Analysis of strike patterns across Hajiabad, Khorgo, and Jam suggests a coordinated campaign against multiple missile-city sites using the same entrance-denial method.
Reports indicate that Iran’s ballistic missile launch rate dropped sharply early in the campaign, a result consistent with restricted access to stored missiles rather than complete destruction of launch capability.
The persistence of intact launch pits means the long-term threat remains, particularly if repair crews can reopen access tunnels.
Open-source monitoring therefore focuses on signs of clearing activity, new road construction, or repeated strikes indicating attempts to prevent restoration.
The outcome highlights the central challenge of underground warfare, where destroying access can be easier than destroying the protected systems inside.
The Hajiabad strike therefore illustrates the limits of bunker-buster strategy against hardened missile-city infrastructure, where operational denial may be achievable even when structural survival is confirmed.
