A Polish driver tried to smuggle more than £8million of cocaine into the UK in a van delivering toy bricks.
Marek Wisniewski, 45, was jailed for eight years after admitting attempting to import 80 kilos (176lbs) of Class A drugs.
Canterbury Crown Court was told the drugs had a potential street value of £8.1million.
The National Crime Agency (NCA) launched a probe after Border Force officers stopped him attempting to pass through Dover's Eastern Docks on May 29 this year.
They searched the vehicle and found blocks of the class-A stuffed in holdall bags hidden behind pallets.
They were amongst boxes of toy bricks destined for a company address in Cambridgeshire.
Wisniewski, from the industrial city of Bytom, had started his journey from southern Poland. When interviewed, he claimed he had no idea how the drugs had got there.
NCA Dover Branch Commander Martin Grace said: "Serious and organised crime networks rely on people like Wisniewski to carry out the leg work. Now he will have to face the consequences.
"The profit that can be made from drugs mean criminals will try almost anything to smuggle their product into the country and evade detection.
"Working with partners like Border Force, we have been able to stop this cocaine reaching the streets of the UK and caused disruption to the group behind it."
Wisniewski was also ordered to forfeit the drugs, phones and van.
David Smith, Border Force regional director, said: "Illegal drugs have a significant impact on our society, being the root cause behind countless burglaries, thefts and robberies.
"They are also used as a commodity by organised criminals linked to violence and exploitation of the vulnerable.
"Border Force will continue to work with our law enforcement partners at the NCA to bring offenders like Wisnieskwi to justice and to disrupt the workings of organised criminal groups in the UK."
