Spanish police on Thursday said they had busted a network that saw smugglers swim on the high seas to help stash Colombian cocaine on Europe-bound container ships and hijack vessels. The bust was revealed just three days after Spain announced its largest-ever seizure of cocaine at sea.

The network employed a so-called "monkey" technique, which used "youngsters who are good swimmers and from low-income families to load the drug on the vessels that were on the high seas," police said in a statement.

Other members of the scheme travelled to Spain to "raid the containers by intercepting the ships before their arrival at the Gibraltar Strait," a busy and narrow body of water separating Europe and North Africa.

Last year, the crew of a ship bound for the southern Spanish port of Cadiz reported stowaways on the deck, with 1.3 tons of cocaine found in a container, police said.

Shortly afterwards, another ship passing through Portuguese waters raised the alarm about "the hijacking of the vessel" by armed stowaways who unloaded cocaine concealed in a container.

????Desarticuladas 3 organizaciones criminales del Balkan Cartel dedicadas al tráfico de cocaína en #Málaga y #Cádiz

???? 30 #detenidos
???? 2.475 kg de cocaína incautados
???? #Armas de guerra intervenidas pic.twitter.com/dYorwRBYd0

— Policía Nacional (@policia) January 15, 2026

The investigation discovered that the network allegedly retrieved the drug by throwing it overboard from merchant vessels to smaller, faster boats close to Europe, "subduing the ships` crew and extracting the drug from the containers using military techniques and weapons of war."

The cocaine was then stored in southern Spain before its transportation by road to other European countries.

The authorities made 30 arrests and seized 2.4 tons (5,291 pounds) of cocaine, military-grade weapons, ladders used to raid the ships, luxury vehicles and cash.

Police released video of the operation on social media, showing officers uncovering packages of alleged drugs as well as cash. The social media post also included footage and images of one of the cargo ships that allegedly carried the drugs.

Spain`s close ties with Latin America and proximity to Morocco, a top cannabis producer, make it a key entry point for drugs into Europe.

On Monday, Spanish police announced their largest-ever seizure of cocaine at sea after impounding a Europe-bound container ship in the Atlantic Ocean carrying almost 10 tons of the drug.

Last October, Spanish police seized 6.5 tons of cocaine and arrested nine people after a U.S. tip-off led them to raid a ship off the Canary Islands.

In June 2025, police forces dismantled a drug trafficking ring that used what authorities called high-speed "narco boats" to smuggle large quantities of cocaine from Brazil and Colombia to the Canary Islands. The ring allegedly used an abandoned shipwreck as a refueling platform for the speedboats.