The Collapse of the Asymmetric Doctrine: The Strategic Anatomy of the GBU-72 Strike Targeting Underground Missile Tunnels
On March 17, CENTCOM announced that it had wiped Iranian missile facilities near Hormuz off the map using 5,000-pound GBU-72 bunker-busting bombs, which saw combat for the first time. This destruction, which began in the heart of darkness, turned billions of dollars in underground investments into fragile rubble in a single night.
The Iranian military believed that missile launchers hidden deep within mountains and at the bottom of the sea were undetectable. These underground networks, viewed as a bastion of logistical and strategic security, were dubbed “missile cities.” However, a 5,000-pound bomb fired for the first time in the history of warfare shook this asymmetric warfare doctrine to its core. The operation began with the neutralization of Iran’s coastal air defense networks.
Under the cover of night, EA-18G Growler electronic warfare aircraft completely SUPPRESSED the radar and communication systems along the coastline. Under the cloak of invisibility provided by electronic suppression, B-1B Lancer bombers and F-15E Strike Eagles simultaneously headed toward the target. The targets were underground complexes belonging to the IRGC Navy, hidden along the coast of Bandar Abbas and the Hormozgan province. F-15E pilots placed GPS-guided GBU-72 bombs with millimeter precision at the entrances to tunnels spanning several meters in width.
Underground Trap: The Strategic Ambush Set in the Strait of Hormuz
These tunnels were not simple shelters; they were massive complexes with shafts capable of reaching depths of 500 meters, wide enough for trucks to pass through, and with a total length spanning dozens of kilometers. They housed Qader 380 L cruise missiles with a range of 1,000 km capable of evading radar. Iran’s plan was this: to close the Strait of Hormuz to civilian ships to drive up oil prices and TRAP the U.S. Navy in a narrow corridor.
Commercial ships were merely bait; the real target was to strike U.S. warships forced into the 21-mile-wide passage with simultaneous missile strikes from both the shore and underwater. Mobile launchers were designed to emerge from the tunnel on rail systems, fire within seconds, and return. However, with the GBU-72 entering the fray, this deadly trap backfired on the Iranian military. The 2.3-ton munition, instead of exploding on the surface, burrowed into the ground, penetrating over 50 meters to SHATTER the structure from within. The blast wave became trapped within the tunnel corridor, creating far more destructive damage than it would have in open terrain.
A Victory for Intelligence and the Collapse of Propaganda
The most striking aspect of the operation was how facilities hidden for a decade were mapped down to the millimeter. The U.S. maintained constant surveillance of the Gulf using SBIRS infrared satellites, KH-11 optical reconnaissance satellites, and P-8A Poseidon patrol aircraft. The biggest blow, however, came from AI-powered target detection systems like Project Maven. Algorithms scanned millions of satellite images to detect activities such as vehicle movements, temperature changes, and concrete pouring. Details that the human eye missed were REVEALED by artificial intelligence.
Behind Iran’s being caught off guard lay a strategic arrogance. They had calculated that the U.S.’s limited fleet of B-2 bombers (capable of carrying the GBU-57) could not strike all the tunnels. However, the integration of the GBU-72 into the extensive F-15E and B-1B fleets upended that calculation. Even more ironic were the propaganda videos Iranian commanders proudly produced. The tunnel entrances, interior corridors, and launch positions shown on camera provided U.S. intelligence with invaluable data on tunnel height, wall thickness, and internal layout. Iran’s propaganda victory turned into an intelligence failure.
The New Geopolitical Equation: Hormuz Is No Longer a Hostage
The March 17 attack went beyond being a mere military operation, permanently altering the strategic balance. Instead of directly striking missiles 300 meters underground, the GBU-72 destroyed the launch galleries and exit doors that is, the critical points located below 50 meters. The missiles inside the fortress with its collapsed gate turned into piles of expensive metal unable to exit. This situation paralyzed Iran’s “shore-to-sea” capability the most critical pillar of its capacity to keep the strait closed.
The shift in the Hormuz equation sent a clear message not only to Tehran but also to Beijing. China’s underground infrastructure, built around nuclear shelters and command centers, now faces a new threat multiplier with the GBU-72’s integration into even F-15E fighters. China has accelerated efforts to bury its own facilities deeper underground. Iran’s “build and forget” strategy of invulnerable underground fortresses proved its fragility in a single night operation by a bomb that had never seen combat. That night, it wasn’t just a few tunnels that were destroyed; an entire asymmetric warfare doctrine took a DEADLY BLOW.
