6-Apr-2026, 1:22 PM, The United States intensified its military campaign against Iran by targeting underground missile infrastructure, including fortified sites near the strategically important Strait of Hormuz.
The strikes highlighted the growing focus on Iran’s underground military facilities, which are designed to protect missile systems and other assets from conventional air attacks. US forces have increasingly targeted these facilities as part of the wider campaign against Iran’s missile and military capabilities.
US Targets Underground Missile Infrastructure
US forces have used deep-penetration weapons against Iranian missile sites located underground.
According to reporting on the operation, US Central Command said American forces employed multiple 5,000-pound deep-penetration munitions against hardened Iranian missile sites along the country’s coastline near the Strait of Hormuz.
The targets are different from conventional surface-level military facilities because underground bases can provide additional protection against airstrikes.
Iran has developed a network of underground military installations, including facilities associated with missile operations. Such locations can be difficult to disable because important equipment and access routes may be protected beneath substantial layers of rock and concrete.
Why Underground Sites Are Important
Underground missile facilities are designed to make military assets harder to detect and destroy.
Iran has invested heavily in hardened and concealed military infrastructure. These facilities can include missile storage areas, launch positions, command facilities and protected tunnels.
The US decision to use deep-penetration weapons reflects the difficulty of targeting such infrastructure with conventional munitions.
A report by Business Standard noted that the weapons used in the strikes were believed to include the GBU-72 Advanced 5K Penetrator, although the exact weapon involved was not officially confirmed at the time of its report.
Bunker-Buster Weapons Used Against Hardened Targets
Bunker-buster weapons are designed to penetrate hardened structures before detonating.
Unlike conventional bombs that may explode when they hit a surface, deep-penetration weapons use reinforced casings to pass through layers of earth, rock or concrete before detonating inside or near a protected target.
The GBU-72 is a 5,000-pound-class penetrator designed to address hardened and deeply buried targets. Reports have linked the weapon to US operations against Iranian underground missile infrastructure.
The exact damage caused to individual underground facilities can be difficult to assess from outside because much of the infrastructure is located below ground.
Strait of Hormuz Adds Strategic Importance
The location of some of the targeted facilities makes the strikes particularly significant.
The Strait of Hormuz is one of the world’s most important maritime energy routes. Any prolonged disruption in the area can affect shipping, energy markets and international trade.
US officials have said Iranian military capabilities around the region pose risks to shipping and other activity in and around the Strait of Hormuz. The targeting of missile infrastructure near the coastline is therefore connected not only to the broader military campaign but also to efforts to reduce threats to maritime traffic.
Iran’s Underground Military Network
Iran’s underground military facilities have become an important part of the conflict because they can allow missile units to remain operational even after surface installations are attacked.
Analysts have also documented repeated strikes against Iranian underground missile bases during the conflict.
The Center for Strategic and International Studies has reported that US forces have targeted Iranian missile infrastructure, including underground facilities such as the Khorramabad missile base.
Repeated attacks on entrances and access routes can make it harder for Iranian forces to move missiles and equipment in and out of underground locations.
Military Campaign Continues
The strikes are part of a wider US effort to reduce Iran’s ability to launch missiles and operate military systems.
A March 31 US military briefing said American forces continued targeting Iran’s ballistic missile and unmanned-aircraft capabilities, along with the logistics and supply chains supporting those programmes.
The campaign therefore extends beyond individual missile launches. It includes attempts to damage storage facilities, launch infrastructure, supply networks and other parts of Iran’s military system.
Impact on the Wider Conflict
The strikes could increase pressure on Iran’s military infrastructure, but assessing their overall effect remains difficult.
Underground facilities are specifically designed to withstand attacks, and determining the extent of damage can require satellite imagery, intelligence assessments and additional information from military authorities.
The attacks also carry broader regional implications because the conflict has already affected shipping and security concerns around the Strait of Hormuz.
Any prolonged disruption could create additional uncertainty for energy markets and international trade.
Regional Security Concerns
The strikes also underline wider security concerns across the Middle East. Governments and international organisations are closely watching developments around Iran, Israel and the Strait of Hormuz. Any further military escalation could affect regional stability, commercial shipping and energy markets, making diplomatic efforts increasingly important alongside military operations to prevent further regional instability and protect international trade routes.
What Happens Next
The next phase of the conflict will depend partly on whether Iran can maintain access to its underground missile infrastructure and continue launching attacks.
For the United States, targeting protected military facilities is likely to remain an important part of efforts to reduce Iran’s missile capabilities.
For Iran, maintaining access to launch sites, replacing damaged equipment and keeping supply routes functioning will remain significant challenges.
The situation around the Strait of Hormuz will also continue to be closely watched because developments there can affect countries far beyond the immediate conflict zone.
Conclusion
The US strikes against Iranian underground missile sites mark another escalation in the campaign against Iran’s military infrastructure.
The use of deep-penetration weapons reflects the difficulty of targeting facilities built beneath the ground and protected by hardened structures. Reports have linked the strikes near the Strait of Hormuz to efforts to reduce threats from Iranian missile infrastructure.
The broader impact of the attacks remains uncertain, particularly because much of Iran’s military infrastructure is underground.
As the conflict continues, developments involving missile bases, shipping around the Strait of Hormuz and the wider regional security situation will remain important areas to watch.
Sources: Reuters, US Central Command, CSIS, Business Standard.
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