It was an unprecedented attack years in the making, with some last-minute misdirection meant to give the operation a powerful element of surprise.

In a significant military action on Sunday morning, U.S. pilots deployed 30,000-pound bombs targeting two critical underground uranium enrichment facilities in Iran. This operation aimed to deliver a decisive hit on Iran’s nuclear program, which is seen by Israel as a major threat and has been under assault for over a week. The mission was supported by American sailors who launched numerous cruise missiles from a submarine at additional locations.

Named Operation Midnight Hammer, U.S. sources describe the initiative as a “precision strike” that they claim severely damaged the Iranian nuclear capabilities. However, a thorough assessment is still underway. Despite these claims, Iran has dismissed any significant destruction and vowed to strike back.

The operation saw B-2 stealth bombers, launched from the central United States, delivering a total of 420,000 pounds of explosives. They were accompanied by numerous refueling tankers and fighter jets, some of which also released missiles. According to U.S. officials, Iran failed to detect the approaching assault and was unable to counter the stealthy American aircraft.

The operation relied on a series of deceptive tactics and decoys to maintain the secrecy, U.S. officials said hours after the attack, which was preceded by nine days of Israeli attacks that debilitated Iran’s military leadership and air defenses.

A decoy plan

Even before the planes took off, elements of misdirection were already in play. After setting parts of the plan in motion, Trump publicly announced Thursday that he’d make a decision within two weeks on whether to strike Iran – ostensibly to allow additional time for negotiations, but in actuality masking the impending attack.

One group of B-2 stealth bombers traveled west from Missouri on Saturday as decoys, drawing the attention of amateur plane spotters, government officials and some media as they headed toward a U.S. air base in the Pacific. At the same time, seven other B-2s carrying two “bunker buster” bombs apiece flew eastward, keeping communications to a minimum so as not to draw any attention.

Air Force Gen. Dan Caine, the chairman of the Joint Chiefs of Staff, said at Sunday’s briefing that it was all “part of a plan to maintain tactical surprise” and that only “an extremely small number of planners and key leaders” knew about it in Washington and Florida, where U.S. Central Command is based.

After 18 hours of furtive flying that required aerial refueling, the armed B-2 Spirit bombers, each with two crew members, arrived on time and without detection in the Eastern Mediterranean, from where they launched their attack runs. Before crossing into Iran, the B-2s were escorted by stealthy U.S. fighter jets and reconnaissance aircraft.

A graphic released by the Pentagon showed the flight route as passing over Lebanon, Syria and Iraq. It was unclear whether those countries were notified of the U.S. overflight in advance. Most U.S. lawmakers were also kept in the dark, with some Republicans saying they were provided a brief heads-up by the White House before the strike.

“Our B-2s went in and out and back without the world knowing at all,” Secretary of Defense Pete Hegseth told reporters Sunday.

A multifaceted attack

About an hour before the B-2s entered Iran, Caine said that a U.S. submarine in the region launched more than two dozen Tomahawk cruise missiles against key targets, including a site in Isfahan where uranium is prepared for enrichment.

As the U.S. bombers approached their targets, they watched out for Iranian fighter jets and surface-to-air missiles, but encountered none.

At 6:40 p.m. in Washington and 2:10 a.m. in Tehran, the first B-2 bomber dropped its pair of GBU-57 massive ordnance penetrators on the deeply buried Fordo uranium enrichment plant. It was the first time these so-called “bunker busters” had ever been used in combat. Each 30,000-pound bomb is designed to burrow into the ground before detonating a massive warhead.

The Fordo site received the bulk of the bombardment, though a couple of the enormous bombs were also dropped on a uranium enrichment site at Natanz.

The U.S. bombs fell for about half an hour, with cruise missiles fired from submarines being the last American weapons to hit their targets, which included a third nuclear site at Isfahan, Caine said.

Both Iran and the U.N. nuclear watchdog said there were no immediate signs of radioactive contamination around the sites.

A look at the numbers

The mission included:

– 75 precision-guided weapons: these included 14 GBU-57 “bunker buster” bombs deployed by the seven B-2 Spirit stealth bombers, and more than two-dozen Tomahawk cruise missiles launched from a U.S. submarine.

– 125 aircraft, including the B-2 bombers, fighter jets and refueling planes.

A female pilot

Hegseth said Sunday that “our boys in those bombers are on their way home right now.”

But a U.S. official said one woman was among those piloting the B-2 bombers. The official spoke on the condition of anonymity because they were not authorized to speak about the mission publicly.

A bit of history

Caine said the use of the bunker-buster bombs made the mission historic, as did other elements.

“This was the largest B-2 operational strike in U.S. history, and the second longest B-2 mission ever flown, exceeded only by those in the days following 9/11,” he told reporters Sunday.