US Weighs 'Mother of All Bombs' Use Against Iran's Nuclear Sites Amid Escalating Tensions

US officials have revealed that plans are in place to strike Iran's energy infrastructure and nuclear sites with the GBU-43/B Massive Ordnance Air Blast (MOAB) bomb, the largest non-nuclear munition in the American arsenal, should President Donald Trump authorize renewed combat operations. This potential deployment of the MOAB, infamously nicknamed the “mother of all bombs,” could significantly escalate the current conflict, especially as fighting has recently subsided. Concerns are mounting, even within the Trump administration, regarding the strategic effectiveness of such a move. Sources familiar with military planning discussions have indicated to CNN and Al Jazeera that deploying the MOAB is unlikely to achieve stated US goals, such as dismantling Iran’s nuclear capabilities. Military expert Elijah Magnier, based in Brussels, stated that the MOAB might not even be capable of destroying Iran's deeply buried nuclear installations, suggesting such an action would primarily serve as “political theatre.”

The GBU-43/B Massive Ordnance Air Blast Bomb (MOAB) is a substantial munition weighing approximately 9,800kg (21,605 pounds) and containing about 8,500kg (18,000 pounds) of high explosives. Measuring over 9 meters (about 30 feet) in length, it is comparable in size to a small yacht. Due to its dimensions, the MOAB is typically deployed from a Lockheed C-130 Hercules cargo aircraft, as it does not fit in stealth bombers. First manufactured between 2002 and 2003, the bomb has undergone 12 detonation tests. Its nickname is derived from former Iraqi President Saddam Hussein's rhetoric during the 1991 Gulf War. The US has previously deployed the MOAB only once, in 2017, against an Islamic State Khorasan Province (ISKP) cave and tunnel complex in Afghanistan, where Afghan authorities reported 94 ISKP fighters killed with no civilian casualties, though unconfirmed local reports suggested otherwise and noted significant property destruction.

Designed to detonate a few feet above the ground, the MOAB generates lethal waves of fire, capable of destroying buildings, cave entrances, and other surface structures. According to military expert Colonel Nidal Abu Zeid, the bomb's purpose is to create an exceptionally powerful blast over a wide surface area. Abu Zeid also noted that the MOAB does not require impact to detonate, and its blast can obliterate everything above ground within a 1km (0.6-mile) radius. He suggested the US might intend to use it against Iran’s above-ground positions and potentially its underground facilities, such as Pickaxe Mountain, which Trump has previously threatened. However, Magnier cautioned that the bomb's effectiveness is terrain-dependent and may not be suitable for deeply buried targets. Some of Iran's nuclear sites, like the Fordow complex and the under-construction site at Pickaxe Mountain, are heavily fortified and buried deep underground. Magnier stated that while the MOAB can cause devastating effects against exposed personnel, equipment, and vulnerable structures, its Afghanistan deployment demonstrated its utility against cave-and-tunnel positions rather than all types of underground installations. Unlike the GBU-57 Massive Ordnance Penetrator, the US military's most powerful bunker buster designed to penetrate up to 200 feet underground, the MOAB is not specifically engineered for deep subterranean penetration.

The potential use of the MOAB in Iran raises questions about its strategic value. Magnier pointed out that deploying the necessary aircraft to regions with Iranian nuclear sites could be challenging, as stealth bombers, better suited for such terrain, cannot carry the MOAB. He also suggested that destroying infrastructure might not compel Iran to make concessions and could transform a “spectacular event” into one with limited political gains for Washington. Magnier questioned the strategic advantage, asking, “What will this weapon accomplish that another available weapon cannot, and how will that result advance an achievable political settlement?” He concluded that if the primary motivation is the spectacle, it serves better as “political theatre” than military strategy. CNN reported that President Trump has privately sought a “definitive” end to the conflict that would demonstrate Washington's undefeated status.

Experts warn that a MOAB strike could provoke a significant response from Iran, potentially including invasions of neighboring countries hosting US military assets. Iranian security officials have previously alluded to capturing US troops in countries like Kuwait to force Washington's surrender. In May, Kuwait reported an incursion by Iran’s Islamic Revolutionary Guard Corps (IRGC) sailors on Bubiyan Island, resulting in a skirmish. Iran denied the incursion, attributing it to navigational system malfunctions. IRGC security adviser Mohammad Reza Naghdi recently reiterated threats of capturing troops if the US launches ground attacks, though military experts have generally dismissed Trump's invasion threats due to Iran's mountainous terrain. Iran has reportedly been preparing for renewed conflict by stockpiling weapons, fortifying key sites, and mobilizing supporters. Mohsen Rezaei, head of the National Security Council, threatened on Sunday to attack regional digital infrastructure, including communication cables and data centers in the UAE, if American strikes resume.