The GBU-57 A/B Massive Ordnance Penetrator (MOP) is a hefty 30,000-pound (around 13,600 kg) precision-guided bomb crafted by the United States Air Force. Its main purpose? To take out deeply buried and heavily fortified underground targets like nuclear bunkers, command centers, and weapons storage facilities.
Unique Features
Size and Weight:
This bomb stretches about 20 feet (6.2 meters) long and weighs roughly as much as a city bus, making it one of the largest conventional bombs in the U.S. arsenal.
Penetration Capability:
It’s built to dive deep, capable of penetrating up to 60 meters (about 200 feet) of reinforced concrete with a strength of 5,000 psi, or about 8 meters into 10,000 psi concrete. It can even go tens of meters into hard rock before it detonates. This impressive feat is thanks to its massive weight, high density, and an ogive-shaped nose that helps distribute impact forces gradually, allowing it to bore deep underground without falling apart.
Kinetic Energy:
When it hits, the bomb can reach speeds that exceed Mach 1 (the speed of sound), delivering kinetic energy similar to that of a 285-ton Boeing 747 landing at 170 mph, all focused on a small area. This helps it break through tough layers of rock and concrete.
Explosive Payload:
Inside, the warhead packs about 5,342 pounds of high-performance explosives (AFX-757 and PBXN-114), designed for a controlled detonation in confined underground spaces. This explosive charge makes up about one-fifth of the bomb’s total weight.
Smart Fuzing System:
It comes equipped with a programmable Large Penetrator Smart Fuze (LPSF) that can “count” layers of rock or concrete, spot hollow spaces like tunnels or chambers, and detonate the warhead at just the right depth to maximize destruction.
Guidance and Delivery:
The GBU-57 relies on a GPS/Inertial Navigation System (INS) for precise targeting, along with grid fins for mid-course flight adjustments. Right now, it can only be deployed by the B-2 Spirit stealth bomber, which can carry two of these massive bombs.
Usage:
The GBU-57 is designed specifically to tackle tough, deeply buried targets that regular bombs just can’t handle, like Iran’s Fordow nuclear facility, which is hidden beneath around 300 feet of rock and concrete.
Even with all the buzz in the media, the U.S. Air Force has confirmed that the GBU-57 has never actually seen combat, and there are only a few of them in stock.
Israel has shown interest in getting their hands on the bomb and the B-2 bomber capabilities to take out Iran’s nuclear bunkers, but as of June 2025, the U.S. hasn’t allowed access.
Summary:
The GBU-57 Massive Ordnance Penetrator is an incredibly powerful, non-nuclear bunker-buster bomb crafted to obliterate the most fortified underground targets. It achieves this by merging immense kinetic energy with a large, precisely timed explosive charge. Thanks to its cutting-edge guidance and smart fuzing systems, it can hit with remarkable accuracy and explode deep inside hardened structures, making it the only conventional weapon that can effectively neutralize targets like Iran’s deeply buried nuclear facilities.






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