During recent months, media outlets have dedicated special coverage to the latest narco submarine seizures carried out by the U.S. Coast Guard and other partner agencies. In our 2015 Foreign Military Studies Office report, Narco-Submarines: Specially Fabricated Vessels Used for Drug Smuggling Purposes, we discussed the strategic implications associated with this innovative method of transporting narcotics. We explained that narco submarines originated in the early 1990s and have been used since then as an alternative to other less covert methods of distribution. Over time, narco submarines’ design, features, and technical capabilities have continued to evolve. This advancement in technology has certainly presented challenges to law enforcement authorities and militaries. Nonetheless, in spite of the evolution of narco submarine technology, the U.S. Coast Guard and U.S. Navy have developed their own sophisticated set of technologies which allows them to improve their ability to detect and capture these vessels.
Who: Drug cartels, especially many based in Colombia, manufacture narco submarines.
What: Narco submarines are used to transport narcotics from Colombia to other countries in Central America as well as Mexico.
When: This method of distributing narcotics became more prominent around the year 2006. A larger number of narco submarines have been seized since around 2007, mostly in the Pacific Ocean, with a smaller number in the Caribbean Sea. 
Where: Drug traffickers have used mostly low profile vessels (LPVs) to transport narcotics from Western Colombia and Northwest Ecuador to Central America, frequently via the Pacific Ocean. The majority of these vessels travel past Panama, Costa Rica, and Nicaragua, and often are intended to reach other countries in Central America as well as Mexico, where their merchandise is then collected and re-routed to other destinations via other delivery methods.
Why: Because of their technical features and low profile design characteristics, narco submarines allow drug traffickers to reduce the risk of detection and seizure. Although there have been several confiscations, it is believed that many of these vessels continue to travel undetected and ultimately reach their intended destinations.
Incident 1: On June 2, 2015, the USS Kauffman [FFG-59] seized 582 kg. of cocaine from an Ecuadorean semi-submersible that was traveling in the Pacific Ocean. The vessel was intercepted near Guatemala. The three crewmen included two Ecuadoreans and one Colombian.  A later article placed the seizure at 779 kg with a street value of USD$15.5 million. 
Incident 2: On July 19, 2015, the U.S. Coast Guard Cutter Stratton [WMSL 752] intercepted and captured a 40 foot long, semi-submersible, low profile vessel in the Pacific Ocean which carried more than 16,000 pounds (over 6 tons) of cocaine. According to reports, the seized narcotics are worth more than USD$180 million wholesale. This represented the largest seizure of its kind in U.S. Coast Guard history at the time. The vessel was detected by U.S. Navy maritime patrol aircraft in international waters about 200 miles south of Mexico. CBS reports that the same U.S. Coast Guard crew which intercepted this vessel has also intercepted 15 other drug smuggling vessels since April 2015, and has seized over 33,000 pounds of cocaine worth over USD$540 million since May 2015. 
A Coast Guard Cutter Stratton boarding team seizes cocaine bales from a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015. The Coast Guard recovered more than 6 tons of cocaine from the 40-foot vessel. (Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone)
With respect to this same narco submarine seizure, The Washington Times  reported:
“Our extremely efficient and experienced aircrews are fully engaged in protecting the United States’ maritime borders from all threats including those posed by drug trafficking organizations,” said Director of National Air Security Operations Center — Jacksonville Robert Blanchard. “Our collaborative interagency partnerships and long-range tracking capabilities allow us to interdict dangerous vessels before they reach our coastal borders.”
Meanwhile, The Washington Post  stated:
“The July effort (interdiction) marked the second time that the (U.S. Coast Guard Cutter) Stratton had stopped this type of narco-submarine in a two-month span. In June, the Stratton crew also stopped a submersible carrying 5,460 pounds of cocaine.”
Taking part in this July 19 interdiction was the U.S. Navy, U.S. Coast Guard, and the U.S. Customs and Border Protection (CBP) Office of Air and Marine (AMO). This joint operation off the coast of El Salvador shows the collaboration taking place across agencies to thwart drug trafficking operations. 
Incident 3: On August 31, 2015, the U.S. Coast Guard seized yet another semi-submersible in the eastern Pacific Ocean. This particular seizure by the USCG Bertholf [WMSL 750] represented nearly 15,000 pounds of cocaine. The vessel was 50 feet long and carried a 4 person crew. It is estimated that the value of this shipment, which was captured west of Mexico, is approximately USD$227 million. The vessel was spotted by U.S. maritime patrol aircraft and intercepted by two long-range U.S. Coast Guard interceptor boats. 
Incident 4: In September 2015, Colombia’s navy captured a semi-submersible that was being prepared to be launched into the Pacific Ocean. According to the official report, the vessel was 12 meters long, 3 meters wide, and could carry 5 tons of narcotics. It is believed that this vessel was built by FARC in the southwestern region of Colombia. 
As we indicated in our 2015 FMSO report, low profile vessels can mask their heat signature, evade sonar and radar, and use lead siding to help mask their infrared signature. These particular technical aspects make their detection and capture exceedingly difficult and have forced law enforcement authorities to design their own technology and methods that counteract this technological race.
The U.S. Coast Guard has increased its technological capabilities as it attempts to intercept drug running vessels in both the Gulf of Mexico and in the Pacific Ocean. The Coast Guard is collaborating with the U.S. Navy and other agencies as well as utilizing military surveillance aircraft and nuclear fast attack submarines to search for narcotics carrying vessels. The Coast Guard has also been using HC-130 Hercules aircraft which provide surveillance and tracking of drug trafficking vessels in the Pacific Ocean. 
The U.S. is also working through the Joint Interagency Task Force (JIATF) South, a component of SOUTHCOM composed of multiple federal and partner nation agencies and military forces. Together, these agencies carry out detection and monitoring operations and share information that supports law enforcement interdictions of illicit trafficking. 
It is difficult to determine how many drug carrying vessels are currently being deployed and which specific routes they are using. Drug traffickers realize that there are risks involved with these operations, yet they consider captured vessels as a cost of doing business. In spite of the interdictions to date, we can suppose that drug traffickers continue to use this transportation and delivery method as it continues to yield high profits even when seizures are factored into the cost-benefit analysis.
The efforts carried out by the Joint Interagency Task Force (JIATF) South, including the U.S. Coast Guard and the U.S. Navy, must continue to reconcile the complexity of the challenges presented by evolving narco submarine technology and the ingenuity of drug trafficking organizations.
Collaboration and communication between law enforcement agencies and militaries are imperative to improving the efficiency and effectiveness of ongoing interdiction efforts. Although detection and monitoring technology have improved, this alone is not sufficient. In order to more accurately disrupt drug trafficking operations, governments and their law enforcement agencies must improve their exchange of intelligence and share best practices that enable them to adjust to the dynamic counter actions introduced by drug traffickers.
 Byron Ramirez, and Robert J. Bunker, Narco-Submarines: Specially Fabricated Vessels Used For Drug Smuggling Purposes. Fort Leavenworth, KS: U.S. Army Foreign Military Studies Office (FMSO), 2015, http://fmso.leavenworth.army.mil/Collaboration/Interagency/Narco-Submarines.pdf
 Lic. Marco Proaño, “Embarcación ecuatoriana fue capturada con 582 Kg de droga.” Armada del Ecuador. 15 June 2015, http://www.armada.mil.ec/embarcacion-ecuatoriana-fue-capturada-con-582-kg-de-droga/
 “USS Kauffman Finds 775 Kg of Cocaine in the Eastern Pacific.” Naval Today. 8 July 2015,http://navaltoday.com/2015/07/08/uss-kauffman-finds-775-kg-of-cocaine-in-the-eastern-pacific/
 “Alameda Coast Guard Crew Seizes Narco-Submarine Carrying 8 Tons Of Cocaine.” CBS San Francisco. 5 August 2015, http://sanfrancisco.cbslocal.com/2015/08/05/alameda-coast-guard-crew-seizes-8-tons-of-cocaine-from-narco-submarine/
 Douglas Ernst, “‘Narco-submarine’ with 8 tons of cocaine seized by U.S. off in the eastern Pacific Ocean.” Washington Times. 23 July 2015,http://www.washingtontimes.com/news/2015/jul/23/narco-submarine-8-tons-cocaine-seized-us-coast-el-/
 Sarah Larimer, “Why the Coast Guard calls narco-submarines the ‘white buffalo’ of the seas.” The Washington Post. 10 August 2015, http://www.washingtonpost.com/news/morning-mix/wp/2015/08/10/why-the-coast-guard-calls-narco-submarines-the-white-buffalo-of-the-seas/
 Amanda Macias, “US authorities seize a ‘narco-submarine’ filled with 8 tons of cocaine.” Business Insider. 23 July 2015, http://www.businessinsider.com/narco-submarine-with-8-tons-of-cocaine-2015-7
 Kirk Moore, “Coast Guard busts another narco sub.” Work Boat. 24 September 2015,http://www.workboat.com/news-feed/2015/coast-guard-busts-another-narco-sub
 “Al sur de Colombia incautan un ‘narcosubmarino’ en construcción.” El Comercio. 24 September 2015, http://www.elcomercio.com/actualidad/colombia-incautan-narcosubmarino-construccion-ecuador.html
 United States Coast Guard – Office of Aviation Services. 1 January 2014,http://www.uscg.mil/hq/cg7/cg711/c130h.asp
 Evan Munsing and Christopher J. Lamb, Joint Interagency Task Force–South: The Best Known, Least Understood Interagency Success. Strategic Perspectives 5. Washington, DC, Center for Strategic Research – Institute for National Strategic Studies – National Defense University, June 2011,http://ndupress.ndu.edu/Portals/68/Documents/stratperspective/inss/Strategic-Perspectives-5.pdf
Dr. Byron Ramirez is a researcher and analyst who specializes in international political and economic affairs. He completed his PhD in Economics and Political Science at Claremont Graduate University and holds an MA in Economics, a MS in Management, and an MBA. His areas of research include geopolitics, international affairs, globalization, economic and social development, and illicit economies. His most recent publication is the co-edited work Narco-Submarines Specially Fabricated Vessels Used For Drug Smuggling Purposes. Fort Leavenworth, KS: U.S. Army Foreign Military Studies Office.
Dr. Robert J. Bunker is an Adjunct Research Professor, Strategic Studies Institute, US Army War College and Adjunct Faculty, Division of Politics and Economics, Claremont Graduate University. He holds university degrees in political science, government, social science, anthropology-geography, behavioral science, and history and has undertaken hundreds of hours of counterterrorism training. Past professional associations include Distinguished Visiting Professor and Minerva Chair at the Strategic Studies Institute, U.S. Army War College; Futurist in Residence, Training and Development Division, Behavioral Science Unit, Federal Bureau of Investigation Academy, Quantico, VA; Staff Member (Consultant), Counter-OPFOR Program, National Law Enforcement and Corrections Technology Center-West; and Adjunct Faculty, National Security Studies M.A. Program and Political Science Department, California State University, San Bernardino, CA. Dr. Bunker has hundreds of publications including Studies in Gangs and Cartels, with John Sullivan (Routledge, 2013), Red Teams and Counterterrorism Training, with Stephen Sloan (University of Oklahoma, 2011), and edited works, including Global Criminal and Sovereign Free Economies and the Demise of the Western Democracies: Dark Renaissance (Routledge, 2014), co-edited with Pamela Ligouri Bunker; Criminal Insurgencies in Mexico and the Americas: The Gangs and Cartels Wage War (Routledge, 2012); Narcos Over the Border: Gangs, Cartels and Mercenaries (Routledge, 2011); Criminal-States and Criminal-Soldiers (Routledge, 2008); Networks, Terrorism and Global Insurgency(Routledge, 2005); and Non-State Threats and Future Wars (Routledge, 2002).