In a major blow to international drug trafficking networks, Portuguese authorities intercepted a Latin American “narco-submarine” carrying approximately nine tons of cocaine in the Atlantic Ocean, in what is considered the largest seizure of this drug in Portugal’s history. The semi-submersible vessel was stopped about 230 nautical miles (around 430 kilometers) from the Azores archipelago following a coordinated multinational operation.
The joint mission, called Operation Adamastor, involved the Portuguese Judicial Police, Navy, and Air Force, working alongside international partners such as the United States Drug Enforcement Administration (DEA) and the United Kingdom’s National Crime Agency (NCA). Authorities recovered around 265 bales of cocaine from the semi-submersible, although about 35 packages were lost when the fragile vessel sank due to adverse weather conditions.
The drugs, believed to have originated in Latin America, were transported by a crew of three Colombians and one Venezuelan, all of whom were arrested and remain in preventive custody in Ponta Delgada, Azores. Authorities noted that the seizure could be worth hundreds of millions of euros on the black market and highlighted the increasing use of such vessels by criminal organizations to evade maritime patrols.
Semi-submersibles, commonly known as “narco-subs,” are increasingly used in transcontinental trafficking operations because they travel very low in the water, making them difficult to detect. Although traffickers have used this type of vessel since the 1980s, their appearance in European waters—especially along the Atlantic route between Latin America and Europe—reflects a significant escalation in smuggling tactics and a shift in drug distribution patterns.
The interception underscores the importance of international cooperation in combating large-scale drug trafficking. In recent years, similar operations, including earlier narco-submarine seizures with smaller shipments, have required coordination between European agencies, U.S. authorities, and regional partners, highlighting the ongoing challenge for law enforcement to dismantle sophisticated criminal networks operating globally.
Investigations continue to identify the criminal structures behind the shipment and the planned distribution across Europe, emphasizing that such seizures are crucial to disrupting the profitability and reach of international drug cartels.
