In 2016 North Korean hackers planned a $1bn raid on Bangladesh's national bank and came within an inch of success - it was only by a fluke that all but $81m of the transfers were halted, report Geoff White and Jean H Lee. But how did one of the world's poorest and most isolated countries train a team of elite cyber-criminals?

It all started with a malfunctioning printer. It's just part of modern life, and so when it happened to staff at Bangladesh Bank they thought the same thing most of us do: another day, another tech headache. It didn't seem like a big deal.
But this wasn't just any printer, and it wasn't just any bank.
Bangladesh Bank is the country's central bank, responsible for overseeing the precious currency reserves of a country where millions live in poverty.

And the printer played a pivotal role. It was located inside a highly secure room on the 10th floor of the bank's main office in Dhaka, the capital. Its job was to print out records of the multi-million-dollar transfers flowing in and out of the bank.

When staff found it wasn't working, at 08:45 on Friday 5 February 2016, "we assumed it was a common problem just like any other day," duty manager Zubair Bin Huda later told police. "Such glitches had happened before."In fact, this was the first indication that Bangladesh Bank was in a lot of trouble. Hackers had broken into its computer networks, and at that very moment were carrying out the most audacious cyber-attack ever attempted. Their goal: to steal a billion dollars.

To spirit the money away, the gang behind the heist would use fake bank accounts, charities, casinos and a wide network of accomplices.

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