Plan B For Iran

Michael Crowley — Politico June 24, 2015

396128 16: UNDATED PHOTOGRAPH A B-2 Spirit approaches a KC-10A tanker/cargo airplane from McGuire Air Force Base, N.J., for an aerial refueling during a training exercise in this undated Air Force photograph. The B-2 Spirit is participating in Operation Enduring Freedom. (Photo by Gary Ell/US Air Force/Getty Images)

The B-2 stealth bomber would be used to deliver the Massive Ordnance Penetrator. Click to enlarge

President Barack Obama’s nuclear diplomacy with Iran may yet fail. On Tuesday, exactly one week before a June 30 deadline for an agreement, Iran’s Supreme Leader delivered his latest in a series of defiant statements, setting conditions for a deal—including immediate relief from sanctions, before Iran has taken steps to limit its nuclear program—that Obama will never accept. Secretary of State John Kerry warned last week that the U.S. is prepared to walk away from the talks. And even if a deal is reached, the story is not over. The Iranians may break or cheat on an agreement, and try build a nuclear weapon anyway.

That’s why, at least three times in the past year, a B-2 stealth bomber has taken off from an Air Force base in Missouri and headed west to the White Sands Missile Range in New Mexico. For these missions, the $2 billion plane was outfitted with one of the world’s largest bombs. It is a cylinder of special high-performance steel, 20 feet long and weighing 15 tons. When dropped from an altitude likely above 20,000 feet, the bomb would have approached supersonic speed before striking a mock target in the desert, smashing through rock and burrowing deep into the ground before its 6,000 pounds of high explosives detonated with devastating force.

“It boggles the mind,” says one former Pentagon official who has watched video of the tests.

Those flights were, in effect, trial runs for the attack on Iran that President Barack Obama, or his successor, may order if diplomacy can’t prevent Iran from trying to build a nuclear weapon.

Think of it as Plan B for Iran. The failure of diplomacy might lead the U.S. to turn to a weapon finally ready for real-world action after years of design and testing. The so-called “Massive Ordnance Penetrator,” or MOP, represents decades of military research, dramatically accelerated in recent years, focused on the problem of destroying targets buried deep underground.

That research once revolved around places like Russia, Iraq and North Korea. But in recent years, aided by a little-known military team of intelligence analysts, geologists and engineers, it has come to focus on Iran. More specifically, a uranium enrichment facility burrowed more than 250 feet into a mountain, about two hours’ drive south of Tehran.

Iran’s facility, known as Fordow, houses 3,000 centrifuges that can enrich uranium to a purity suitable for nuclear weapons. Fordow is not Iran’s only enrichment facility, or even its largest. But it is the best protected. And it would be all Iran needs to develop a nuclear weapon.

Hardened uranium enrichment facility buried deep underground at Fordow, near the Holy City of Qom. Click to enlarge

Hardened uranium enrichment facility buried deep underground at Fordow, near the Holy City of Qom. Click to enlarge

The mock desert target was almost certainly meant to simulate.

When Obama officials say that “all options are on the table” to stop Iran from getting a nuke, they are in effect speaking in code about the MOP. The MOP is what Secretary of State John Kerry was clearly referring to when he recently told Israeli TV that the U.S. has “designed and deployed a weapon that has the ability to deal with Iran’s nuclear program.” When CNN recently put the question directly — can the MOP destroy Fordow? — to Secretary of Defense Ashton Carter, he was succinct: “Yes. That’s what it was designed to do.”

The Pentagon is otherwise coy. “We maintain military options should diplomacy fail,” is all said Col. Ed Thomas, spokesman for Joint Chiefs of Staff chairman Gen. Martin Dempsey, would tell POLITICO. But former government officials and experts spoke in far more detail. They described a wonder of military hardware that combines high technology with brute physics. It’s a weapon they hope will help intimidate the Iranians into making—and keeping—a deal.

“The message the Pentagon wants to send,” says Loren Thompson, a military consultant and analyst with the non-profit Lexington Institute, “is that there is no safe haven.”


Military planners have studied ways to blow up would-be safe havens since at least World War II, when Britain employed so-called “earthquake” bombs with names like Grand Slam and Tallboy against buried German targets. After a lull during the Cold War, when ICBMs and thermonuclear bombs were all the excavation considered necessary for military targeting, targeted bunker busting came back into favor again when the 1991 Gulf War revealed Saddam Hussein’s elaborate underground network—including a bunker whose German architect boasted it could survive a nearby nuclear blast. The subject seized the Pentagon’s attention anew after September 11, particularly after the early hunt for Osama bin Laden in Afghanistan showed that even B-52 carpet-bombing could only rattle al Qaeda’s mountain lairs. One 2001 report to Congress estimated that there were more than 10,000 buried or “hardened” targets worldwide requiring specialized bombs—many of them in North Korea and China—and that the number was growing.

In August of 2002, an Iranian political opposition group revealed the existence of an underground uranium enrichment facility at Natanz. News of Iran’s secret nuclear program startled Washington, though the site was too shallow to escape the reach of existing American munitions.

The 2009 discovery of the enrichment lab at Fordow was another matter. Fordow is a much smaller facility than Natanz, but it is buried deeper, better reinforced, and protected by mountain rock. In Washington, the Pentagon hit the gas pedal on its bunker buster program and its ability to detect and analyze underground sites.

A locus of this activity is a secretive arm of the Pentagon known as the Underground Facilities Analysis Center (UFAC). Established in 1997 and run by the Defense Intelligence Agency (DIA), the UFAC does not have a website; a DIA spokesman offered few details about it. But it is no backwater. According to one 2009 defense industry report—one of very few news articles to acknowledge the center’s existence— the UFAC’s staff swelled from 20 employees to 240 in its first decade. The number is probably now much higher.

A bunker buster being loaded at the White Sands Missile Range in New Mexico in 2007.

A bunker buster being loaded at the White Sands Missile Range in New Mexico in 2007.

“There’s been a realization over the past several years that our adversaries are looking at some of the best ways to defeat US capabilities, and one of them is to build things underground,” says Austin Long, a professor at Columbia University’s School of International and Public Affairs who has closely studied the issue. “So this has been a non-trivial part of the military and defense enterprise for years now.”

As its name indicates, UFAC isn’t just about hunting underground sites. It’s also about understanding their structure and layout—and figuring out how to destroy them. In addition to intelligence analysts, its staff includes scientists, geologists and people with “expertise in engineering and in all sorts of construction,” according to DIA spokesman James Kudla. Though Kudla would not elaborate, other sources—including a former UFAC employee and declassified documents available through George Washington University’s National Security Archive—offer more detail about its activities.

Like doctors relying on X-rays and MRIs, cave hunters must rely on high-tech equipment that can, in effect, see through solid objects—or sense things like seismic disturbances. That can involve exotic-sounding devices like geophones, laser vibrometers and drones equipped with gravimeters—devices that sniff for gravitational disturbances which suggest an underground cavity. (The U.S. has never explained the mission of an unarmed U.S. drone that crashed in Iran in 2011.)

They also rely on more traditional means, including satellite imagery from the National Geospatial-Intelligence Agency (NGA). That can reveal, say, a new transportation route that suspiciously dead-ends at a mountainside. Analysts also hunt for so-called “effluents,” like liquid waste. Exhaust vents aren’t just a tell, but can also be a vulnerability: Long calls this the “Death Star problem” facing any bunker-builder, a reference to the air shaft that allowed Luke Skywalker to destroy Darth Vader’s massive space station with a single well-placed shot.

Hunched over computers in a commercial building near the Pentagon, UFAC workers analyze suspect sites and determine what it would take to blow them up. That could involve analyzing the soil and rock under which it is buried, its depth, the thickness of its walls and the materials used to reinforce them. Their conclusions are uploaded into targeting databases, including one code-named GEMINI, that are used by military planners worldwide. In the event of an attack, the UFAC, relying heavily on NGA imagery, would also analyze the damage and determine whether follow-up strikes were necessary.

Of course, it doesn’t always take a huge bomb disable a facility: The former UFAC employee notes that the center’s analysis sometimes amounts to saying, “All we gotta do is go over to this power plant and flip a switch” to disable a bunker’s power supply.

Fordow is not such a simple case.


If you drive two hours south of Tehran you will come to the ancient city of Qom, one of Shiite Islam’s holiest cities. Carry on for another half an hour and you will come to Fordow, where the road will reach a security perimeter around a mountain, with anti-aircraft guns scowling at the skies. Beyond the outer fence, the highway branches into four paths which, as seen by satellite image, disappear into black holes in the mountain side.

GBU-57B version of bunker buster.

GBU-57B version of bunker buster.

When the Iranians began constructing Fordow nearly a decade ago, the U.S. could have done little damage to it. At the time, America’s most effective bunker-buster was the GBU-28, a 5,000-pound weapon capable of penetrating roughly 20 feet of concrete or about 100 feet of earth. Fordow is burrowed some 250 feet into the mountain. (Natanz is larger, with about three times Fordow’s 3,000 centrifuges; but at 70 feet deep it is also much shallower and far easier to strike.)

Even before the mountain facility was discovered, military experts were fretting about America’s limitations. Some proposed to use small nuclear weapons to devastate underground targets. But a Bush administration push for nuclear bunker-busters met fierce resistance in Congress, which killed funding for the idea. In response, the Pentagon doubled down on its conventional bunker-buster program.

That program has come a long way in the past decade. The Boeing-designed and produced MOP weighs six times more than the GBU-28, and about 15 times more than that bomb’s predecessor. According to published reports, the MOP can burrow through 200 feet of earth and 60 feet of concrete before its blast destroys whatever it finds there.

As recently as 2012, however, even the MOP lacked the clout to take out Fordow, officials concede. Since then it has undergone repeated upgrades to remedy glitches. The Air Force’s B-2 fleet was upgraded, at a cost of nearly $100 million, to carry the bomb—but two 2013 test flights were aborted after faulty wiring prevented the planes from dropping the MOP. In the past several months, even as Obama’s nuclear diplomacy with Iran advanced, the MOP underwent further upgrades and refinements. Its fuse has been upgraded to ensure it can withstand the bomb’s initial impact with the earth, and its satellite guidance systems refined for more precise targeting. According to unnamed officials cited by the Wall Street Journal in April, the MOP has also been outfitted with countermeasures against Iranian jammers that might try to throw off its GPS system. (A former military official who spoke to POLITICO confirms the upgrades.)

It’s not clear how many of the bombs the Pentagon may now have. According to a 2012 defense industry newsletter report, Boeing delivered 20 MOPs at a reported total cost of $314 million. But at least $82 million has been budgeted for subsequent upgrades; throw in the cost of modifying the B-2 bombers and the price tag could easily be above a half-billion dollars.


Imagine that the nuclear talks do collapse. Iran’s Supreme Leader insists that outsiders will never be allowed onto Iranian military bases to conduct spot inspections. John Kerry throws up his hands and flies back to Washington. President Obama issues a grave statement expressing his hope that peace is still possible. Perhaps Iran then begins accelerating its uranium enrichment at Fordow and Natanz, and intelligence reports suggest that Tehran has decided to try and build a bomb faster than the world can mobilize to prevent it. Or perhaps Obama is succeeded in 2017 by a Republican hawk who decides its time to end the uncertainty about Iran’s program once and for all.