Most people, if asked to plan the perfect heist, would start by watching Ocean's Eleven and end by locking themselves out of their car. The people on this list took a different approach: years of planning, rented offices above diamond vaults, hand-dug tunnels under central banks, and, in one case, simply dressing up as police and knocking. Some got away. Some almost got away. One walked off with half a billion in art that nobody has found in over thirty years.
1. The Antwerp Diamond Heist (2003) — around $100 million in a weekend
The Antwerp Diamond District is not an easy place to rob. The vault targeted in 2003 was protected by roughly ten layers of security: a combination lock, infrared heat sensors, a seismic sensor, a magnetic field, a Doppler radar system, motion detectors, and more. A crew later identified as the "School of Turin", led by a man named Leonardo Notarbartolo, defeated all of them. They had rented an office in the same building for months beforehand — close enough to learn the rhythms of the place, insert themselves into the background, and work through the countermeasures methodically. Over a single weekend, they cleared the vault of an estimated $100 million-plus in diamonds, gold, and jewellery. Notarbartolo was eventually caught — dropped off by accomplices who did not wait around — but most of the haul was never recovered. The security industry responded by quietly redesigning how vault technology gets marketed.
2. The Banco Central Tunnel (Fortaleza, Brazil, 2005) — around $70 million in untraceable cash
In August 2005, staff at Brazil's Banco Central in Fortaleza came in on a Monday to find the vault short by around R$160 million — roughly $70 million in used, non-sequential notes. The kind of cash that doesn't trace. Someone had rented a property nearby, set up a fake landscaping business as cover for the noise and the dirt, and dug a roughly 78-metre (about 256-foot) tunnel directly under the street and up into the vault. The operation reportedly took months. The robbers drilled through reinforced concrete, installed lighting and ventilation inside the tunnel, and timed the exit to a weekend when nobody was around. Dozens of people were eventually arrested and some money was recovered, but a substantial portion of one of the most meticulous bank jobs ever executed remains unaccounted for. The landscaping business, presumably, had a very short trading history.
Digging 78 metres of reinforced tunnel under a live city street — through soil, utilities, and the foundations of other buildings — to reach a single vault is the kind of project most people would call off after the first weekend. The Fortaleza crew called it Tuesday. If the same energy had gone into a legitimate construction company, they'd have been fine.
3. The Isabella Stewart Gardner Museum (Boston, 1990) — around $500 million, still missing
On the night of 18 March 1990, two men dressed as police officers knocked on the side door of the Isabella Stewart Gardner Museum in Boston. The security guard buzzed them in. He should not have. Over the next 81 minutes, the pair — who were not police — removed 13 works of art from the walls, including a Vermeer (The Concert), three Rembrandts, five Degas works, and a Manet. Current estimates put the collection's value at around $500 million. The FBI has called it the largest unsolved art theft in history. The works have never been recovered. The museum still displays the empty frames where the paintings hung, as an act of institutional stubbornness — or hope, depending on how you look at it. A reward of $10 million remains unclaimed.
4. Brink's-Mat (London, 1983) — £26 million in gold that went everywhere
In November 1983, a group of armed robbers broke into a Brink's-Mat security warehouse near Heathrow Airport expecting to find cash. What they found instead was three tonnes of gold bullion, along with diamonds and cash, worth around £26 million at the time. The robbery itself took under an hour. The aftermath took decades. The gold was so thoroughly melted down and laundered into the legitimate jewellery market that it's a persistent — and credible — theory that a significant portion of British gold jewellery bought in the late 1980s and 1990s may contain traces of Brink's-Mat bullion. Several of the gang members were convicted; several others were not. A number of people connected to the aftermath of the robbery died in circumstances that attracted police attention. It remains one of the most consequential robberies in British criminal history, mostly because of what happened after.
5. The Securitas Depot Robbery (Kent, 2006) — £53 million in Britain's largest cash heist
In February 2006, a gang in Kent pulled off the largest cash robbery in British history: around £53 million from a Securitas cash depot in Tonbridge. The plan involved kidnapping the depot manager and his family at gunpoint to force cooperation — an escalation in tactics that ultimately made the crime easier to solve than the haul might have otherwise warranted. Police arrested multiple members of the gang within months. About £21 million of the cash was never recovered. The operation was notable for its scale, its brutality, and the speed at which investigators unravelled it — partly because kidnapping a man's family tends to generate a very motivated witness.
6. The Ronin/Axie Infinity Bridge Hack (2022) — roughly $620 million in crypto
The largest single theft in this list required no tunnel, no disguise, and no vault. In March 2022, attackers exploited the Ronin Network — a blockchain bridge used by the popular game Axie Infinity — and drained approximately $620 million in cryptocurrency. The hack went undetected for six days. The US Treasury later attributed it to the North Korean state-sponsored hacking group Lazarus Group. A portion of the funds was eventually frozen and recovered through blockchain tracking, but a substantial amount was laundered through mixers before investigators could reach it. The heist demonstrated, fairly definitively, that the largest fortunes of the digital era are vulnerable to attacks that happen entirely without anyone leaving a chair — and that the target doesn't need to be a vault when it's a poorly-audited smart contract.
7. What they all have in common
Planning. Almost every entry on this list involved months or years of groundwork — renting offices, digging tunnels, mapping routines, identifying the one weak point in an otherwise hardened system. The actual robbery, in most cases, was the fast part. The slow, unglamorous work of preparation is what made it possible. The ones that got caught, meanwhile, usually tripped not on the heist itself but on what came next: the laundering, the loose associates, the kidnapping charges that created too many witnesses. Crime, as it turns out, has operational risk. The Gardner thieves remain the exception: they planned just enough, executed quickly, and then vanished. The empty frames in Boston are the evidence that sometimes it works.