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On a September night in 1997, six men hit the Dunbar Armored facility in Los Angeles and walked away with $18.9 million. At the time, it was the largest cash robbery in US history. Allen Pace III, a safety inspector who worked there, masterminded the whole thing because he knew the camera blind spots. The crew wore masks, rushed the guards during a shift change, loaded rented U-Haul trucks, and vanished in thirty minutes. In $100 bills, $18.9 million weighs about 189 kilograms, or 416 pounds. It shrinks down to just 0.21 cubic meters. You could fit the entire haul in the trunk of a large sedan. The gang only got caught because one of them bought a jet ski and paid cash for home renovations.

This one sounds like a movie plot because it literally became one. In 2015, a crew of elderly British criminals drilled through a half-meter concrete wall at a safe deposit facility in London's jewelry district. The oldest guy was 76. Over the Easter weekend, they disabled the elevator, rappelled down the shaft, and used a massive diamond-tipped drill. They cracked 73 safe boxes and took an estimated £14 million in cash and gems. The crew got caught because they were incredibly sloppy. They used their personal cell phones, and one guy literally drove his own registered car to the robbery.

This crew tunneled 256 feet under the streets of Fortaleza, Brazil, right into a bank vault. They got away with about $70 million USD in Brazilian Real. To cover their tracks, they set up a fake landscaping company called 'Grass and Gardens' across the street and spent three months digging. The tunnel was a serious piece of engineering, complete with wooden supports, lighting, and air conditioning. The police never found any fingerprints or DNA. Because the cash was mostly in used R$50 notes, it weighed nearly 1,400 kilograms. That means they hauled three thousand pounds of paper out of a tunnel in duffel bags entirely by hand.

The day before the US invasion of Iraq began in 2003, Saddam Hussein sent an order to the Central Bank of Iraq to withdraw nearly a billion dollars in cash. Three tractor-trailers pulled up and loaded an estimated $900 million in $100 bills, plus another €90 million. Later on, American troops found hundreds of millions more hidden inside the walls of his palaces. A billion dollars in $100 bills is 10 million individual notes. It weighs ten metric tons. You physically cannot steal that much cash without industrial heavy machinery and a fleet of trucks.

Every single cash heist runs into the exact same bottleneck: money is remarkably heavy. One $100 bill weighs about a gram. If you steal a million dollars in hundreds, it weighs 10 kilograms. That is easy enough to throw over your shoulder. But if you steal ten million, you are hauling a hundred kilograms. A billion dollars weighs ten metric tons. Criminals actually prefer taking smaller bills because they are easier to spend without raising suspicion, but $20 bills weigh five times as much per dollar value. The physical weight of paper money is the real reason these crews need armored trucks instead of duffel bags.

We are probably never going to see heists like these again. The golden age of tunnel-and-drill bank robberies is basically over. Cash usage drops every single year, so banks do not keep mountains of paper money on site anymore. It gets routed electronically. Modern bills are loaded with GPS dye packs and forensic tracking threads. Today, the biggest financial thefts happen at a keyboard, not a vault. The Bangladesh Bank cyber heist grabbed $81 million through fake SWIFT messages. A hacker hit Axie Infinity for $625 million in crypto. Bank robbers do not carry duffel bags anymore.

The 5 Biggest Cash Heists in History, Visualized

#5: Dunbar Armored Robbery ($18.9M, 1997)

The Heist Deck

#4: Antwerp Diamond Heist ($100M+, 2003)

#3: Hatton Garden Safe Deposit (£14M, 2015)

#2: Banco Central Heist ($70M, 2005)

#1: Central Bank of Iraq ($1 Billion, 2003)

The Logistics Problem

Cash Weight Calculator

The Death of the Vault Job

Cash Heists vs Cybercrime

Sources & References

Alp Yalay

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