British cops tipped off Spanish authorities to a tug boat carrying £200 million worth of cocaine.
Nearly four tonnes of the drug were seized by international law enforcement officers in the Atlantic.
The drugs were found on a tugboat between Portugal's Madeira and Azores islands.
Officials found 165 individual packages of cocaine weighing 23 kg, a total of 3.7 tonnes, hidden in the boat kitchen.
The Comoros-flagged vessel was towed into the Spanish port of Cadiz.
Spain confirmed they were acting on intelligence from the UK's National Crime Agency (NCA).