A narco-submarine (also called a drug sub or narco-sub) is a type of custom ocean-going, self-propelled, semi-submersible or fully submersible vessel built by (or for) drug smugglers.
Newer semi-submersibles are almost fully submersible in order to reduce the likelihood of detection by visual, radar, sonar, or infrared systems. Cargo capacity varies widely with vessel size, although several tons is typical. In 2015, the largest known cargo of was seized on a semi-submersible craft. Some contemporary narco-subs are capable of crossing the Atlantic Ocean. Meanwhile, recently captured vessels in the central Pacific during the mid 2020s indicate said vessels are increasingly durable enough for their operators to attempt voyages across the Pacific to Oceania.
History During the Prohibition in the United States, bootleggers used low-profile riverboats to evade authorities.
In the 1980s, go-fast boats were the smuggling vessel of choice in many parts of the world. Go-fast boats became more vulnerable to radar detection as radar technology improved, leading to the development of semi-submersibles.
In 1988, an uncrewed submarine was found off Boca Raton, Florida. It was designed to be towed by a boat and submerged by remote control. The sub was empty, but officials and authorities believe it was used for smuggling after it was realized the hatch could be opened only from the outside.
2000s In 2006 a "submarine" was seized southwest of Costa Rica. The U.S. Coast Guard dubbed it Bigfoot because they heard rumors of their existence, but had never seen any prior to this find. In 2006, the U.S. detected three vessels in total, and they estimated between twenty-five and forty semi-subs departed from South America in 2007.
In 2006, a sub was discovered on the north coast of Spain. While its use is unconfirmed, it is speculated to have been built by, or for, narco-traffickers.
In March 2006, according to a press release, the Calabrian criminal organization 'Ndrangheta ordered a shipment of nine tons of cocaine to be transported by a narco-submarine from Colombia to Italy, but according to a countering press release, the vessel was discovered by Colombian and Italian police during construction.
During the first six months of 2008, the U.S. Coast Guard and U.S. Navy detected forty-two subs off the coasts of Central America, but few seizures resulted. According to various press-releases, the projected eighty-five narco-submarine voyages by the end of 2008 could potentially bring about 544 tons of cocaine to U.S. customers. In 2008, the Mexican Navy intercepted a submarine in international waters about southwest of Oaxaca. Mexican Navy Special Forces fast-roped from a helicopter on to its deck and arrested four smugglers. According to one press-release, the vessel carried 5.3 tons of cocaine; it was towed to Huatulco, Oaxaca, by a Mexican Navy patrol boat. Also in 2008, the U.S. Coast Guard captured a semi-submersible vessel in international waters about west of Guatemala; it was carrying 7.0 tons of cocaine. The steel/fiberglass vessel was detected by a U.S. Navy aircraft as part of Operation Panama Express, and was intercepted by Coast Guard Law Enforcement Detachment 402 aboard USS McInerney. Five days later, an semi-submersible was seized in international waters by the USCGC Midgett about south of Guatemala.Videos and images of these two seizures are available at the U.S. Coast Guard web site: Several other submarines were intercepted, but not seized because their crews scuttled them upon interception.
In 2009, the U.S. detected "as many as sixty" submarine related events, and calculated they were moving as much as a ton of cocaine daily. In the same year, three submarines were seized on the shores of the Pacific coast, loaded with 1.5 tons of cocaine. The Colombian Navy had intercepted or discovered thirty-three submarines by 2009.
2010s After the November 5, 2010 arrest of Harold Mauricio Poveda,The mafia rabbit (November 25, 2008) a key Mexican–Colombian link, enhanced interrogation revealed that the FARC (Revolutionary Armed Forces of Colombia) were behind the construction of submarines and were collaborating with the Sinaloa Cartel to fund their activities.Detienen al Conejo, proveedor de El Barbas El Universal. November 5, 2010 (in Spanish)
In 2012, United States Coast Guard officials expressed concerns such vessels could potentially be used for terrorism.
In 2015, the largest recorded seizure was after a cargo of was seized on a semi-submersible by .
In 2016, the U.S. Coast Guard seized a semi-submersible in international waters about 300 miles west of Panama, carrying about 6 tons of cocaine with a street value of about $200 million to U.S. customers.US Coast Guard intercepts vessel carrying cocaine worth $200m. BBC News, 29 March 2016.
In 2017, the U.S. Coast Guard detained a semi-submersible off the coast of Texas carrying of cocaine,U.S. Coast Guard intercepts semi-submersible vessel packed with 3,800 pounds of cocaine. USA Today. 11 December 2017. and on 13 November the US Coast Guard located and seized another one off the coast of Panama.Narco subs: Texas mobilises to stem invasion of narcotic carrying submarines. Jamie Seidel, News Com Australia. 22 December 2017.
In November 2019, a semi-submersible carrying 3 tonnes of cocaine hydrochloride was captured off the Galician coast of Spain after its three crew members—one Spanish and two Ecuadorian nationals—abandoned and attempted to scuttle the vessel. The approximately one-month voyage had begun on the Amazon River, entered the Atlantic Ocean through Brazil and continued toward the European mainland. The operation marked the first capture of a semi-submersible drug-smuggling vessel in Europe.
A narco-submarine was captured by the Peruvian Navy on 8 December 2019 carrying over of cocaine off of the coast of the Department of Piura.
2020s According to a press-release, on November 5, 2020, a submarine was seized in Colombia. A further interception was made in October 2021 by the Ecuadorian naval training ship Guayas in the Pacific Ocean.
The drug trafficker Laureano Oubiña affirmed the existence of a marine cemetery of narco-submarines near the Canary Islands (Spain).
In February 2021, a European-made semi-submersible under construction was found in a warehouse in Málaga, Spain, during a multinational law-enforcement operation. The vessel was 9 metres long and was estimated to have capacity for carrying up to 2 tonnes of drugs. EMCDDA and Europol cited the case as demonstrating that semi-submersibles could also be constructed in Europe.
A long semi-submersible made of vinyl carbon fiber, christened by its builders Poseidón was found sunk without cargo by the Guardia Civil in the Ría de Arousa in March 2023. The vessel had a central hold with a load capacity of five tons, a forward ballast tank and a diesel engine at stern.
In 2024, the Colombian Navy captured a semi-submersible carrying 5 tonnes of cocaine 1,200 miles southwest of Clipperton Island in the Eastern Pacific in a 62 country operation. Having been captured over 3,000 miles from the Colombian coast, the incident has been cited as proof that drug cartels are now willing to use narco-submersibles for direct, long-distance drug smuggling to Australia and New Zealand via a new route exceeding 4,000 miles rather than conventionally hiding smaller amounts of narcotics in commercial shipping.
Over the next year, at least three narco-submarines were discovered in the Solomon Islands alongside another in Tonga after being abandoned by their operators; which has generated concern as the current set of local laws, lack of coast guard coordination, and inexperience within national law enforcement agencies have left Oceanian island nations unprepared to counter the illicit trade. Besides Oceania, narco-submarines have also begun appearing in West African countries like Sierra Leone due to public institutions being more vulnerable to state capture than European counterparts while their locations are ideal relay points to transfer narcotics more easily to European markets via drug mules or hidden amidst local export containers.
In 2025, the United States military destroyed a semi-submersible during the 2025 United States strikes on Venezuelan boats and the 2025 United States naval deployment in the Caribbean. It was confirmed that there were some survivors of the attack that were later captured by the U.S.
In January 2026, Australian and Fijian police managed to capture a narco-submarine shipment of over 2 tonnes of cocaine in Tavua, Fiji. Four Ecuadorian nationals and two locals were also arrested amidst a ship-to-shore transfer from a boat after scuttling the submarine.
In March 2026, as a part of the Ecuadorian conflict (2024–present), Ecuador sank a Narco-submarine located in a mangrove swamp in the Cayapas–Mataje nature reserve near the Northern border, with a drug smuggling camp located nearby.
Crewed
Semi-submersible Most vessels commonly described as narco-submarines are purpose-built semi-submersibles rather than conventional submarines. They are designed to travel with most of the hull below the waterline, reducing their visual profile and making detection more difficult. Vessels seized in the Americas have frequently been constructed in remote areas of the Amazon region, including Colombia, and have been used to transport multi-tonne cocaine shipments.
Construction sites have historically been selected for concealment, access to river systems through which equipment and materials can be moved, and proximity to the sea. Construction and operation can require specialist skills including engineering, welding, electrical work, fibreglass construction, maritime navigation and experienced seafaring.
A 2016 case study of vessels developed by the Revolutionary Armed Forces of Colombia described three broad phases of technological development. Experimental designs between 1992 and 2004 were comparatively limited in capability; a prototyping period in 2005–2006 introduced more capable self-propelled semi-submersibles; and designs observed from 2007 became more standardised, with greater speed and carrying capacity and, in some cases, steel construction, advanced navigation systems, GPS and measures intended to reduce detection. The study described a progression from semi-submersibles intended for a single voyage toward more sophisticated craft capable of repeated journeys.
Conditions for crews can be severe. Accounts examined by Jacome Jaramillo describe cramped interiors, lack of running water, prolonged periods without sleep, engine noise and fumes; vessels have also been deliberately scuttled when interception appeared imminent.
Europol reported in 2026 that semi-submersibles built specifically for cocaine trafficking were becoming increasingly sophisticated and capable of travelling longer distances, with improvements in vessel design facilitating Atlantic crossings.
Typical characteristics These are the typical characteristics for semi-submersibles as stated by the U.S. Joint Interagency Task Force South: Hull material: wood, fiberglass, or steel Length 12–24 m Freeboard 0.5 m Engines: single or twin diesel Fuel capacity: 5.6 cubic metres Range: 3200 kilometers Speed: 11 km/h or more Crew: 4 Capacity 4–12 metric tons Control: human or remote
True submarines
Narco-submarines were considered by officials to be an oddity until 2000, when Colombian Anti-Narcotics Police discovered what was reported to be a half-built 36 m-longEl 'narcosubmarino' Colombiano. El Pais. 11 September 2000. true submarine in a warehouse outside Bogotá. The double-hulled steel vessel could have traveled 3,700 kilometers, dived 100 m, and could have carried about 15 tonnes of cocaine.