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The Colombian drug lord - in which the series focuses on - was once claimed to be the 7th richest man in the world.

Supplying 80% of the world's cocaine, the cartel leader was said to be earning a whopping $420million (£300m) a week during his 10 year reign.

But after Escobar was finally tracked down and shot dead by police in 1993, much has been made of his unfound multi-million fortune.

A lot of his treasure was invested in luxury cars, planes and properties around the continent - even owning two submarines at one stage.

This was almost all confiscated by the government once his death was confirmed.

(Image: EPA)

Yet Roberto Escobar, Pablo's brother and accountant, has revealed how many of the drug baron's millions still have not been discovered.

In his 2009 book, Escobar: The Untold Story Of The World’s Most Powerful Criminal, Roberto talked of how a lot of his brother's hidden treasure was buried in the US, Colombia and parts of Mexico.

When the book was released, only $8million (£5million) had been discovered at a hidden complex built in the jungle, where many cocaine factories had existed.

But last year, there was a breakthrough in the hunt for Escobar's secret stash.

(Image: GETTY) (Image: FORBES)

A Colombian farmer was reported to have found $600million of Escobar's money buried in a field near Medellin in Colombia.

José Mariena Cartolos, 65, discovered hundreds of barrels of cash when starting an oil palm plantation the land, according to local media.

Then earlier this year, the new owners of one of Escobar's Miami mansions stumbled across another piece of the puzzle.

They had chosen to demolish the property after a blaze ripped through the £8million home.

(Image: EPA) (Image: TWITTER)

Yet in gutting the property, they were baffled when they came across a 50-tonne secret vault - belonging to the drug baron.

Owner Christian de Berdouare, a fast food entrepreneur, who lives there with his TV journalist wife Jennifer Valoppi, said: “We had left one of the walls… when I started to knock it down, a piece of rubble hit the foundation, the floor sunk and I saw it.

“It was something gray. I grabbed it with the excavator’s claw, realised it was a safe and started to yell to tell them.”

The couple have now ordered a team to search the home to unearth any further findings.

Some of the drug-driven cash was also placed in secret bank accounts and tax havens in Europe, according to Roberto.

He explains in his book how Pablo was the only person who knew these account numbers.

And therefore the fortune could still be sitting there now - or even lost forever.

He said: "I feel sure there are undiscovered coletas in houses all throughout Colombia - but also in New York and Miami, Chicago and Los Angelesand the other cities in which Medellin did business.

"I am also certain there are bank accounts in countries whose numbers have been lost and forgotten and never will be opened again."