The U.S. Coast Guard in Northern California seized $181 million worth of cocaine in the largest drug bust of its kind, according to a statement released by the organization Wednesday. 
 
 The team raided a semi-submersible vessel carrying 16,000 pounds of narcotics 200 miles south of Mexico in the Eastern Pacific Ocean on July 18. 
 
 Approximately 4,000 pounds of cocaine, which the team purposely left in the vessel to stabilize it, was lost while towing the vessel so, authorities only seized 12,000 pounds. 
 
 Chief Warrant Officer Allyson Conroy said that the U.S. Navy maritime patrol aircraft notified the Coast Guard Cutter Stratton crew in Alameda, California after spotting something that looked suspicious in the water. The Stratton crew sent out its boarding team to that location, where it found the drug vessel. 
 
 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. Image: Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone 
 
 The Coast Guard Cutter Stratton crew is shown with cocaine bales seized from a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015 Image: Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone 
 
 The Coast Guard announced the historic seizure in a statement on Wednesday. All of the information in the drug bust had to be approved by various agencies the Coast Guard works with in the Eastern Pacific, which explains the delay, Conroy told Mashable. 
 
 Though this is the largest drug bust of its kind, the U.S. Coast Guard has disrupted 15 other drug smuggling attempts since April, seizing $540 million and 33,000 pounds of narcotics. 

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 Editor's Note: The amount seized has been updated due to a factual error. It was previously listed as 12,000 pounds. The correct amount seized by the crew was 14,000 pounds. 
 
 ALAMEDA, Calif. – The U.S. Coast Guard seized a self-propelled semi-submersible vessel carrying more than 14,000 pounds of cocaine in the Eastern Pacific Ocean July 18. 
 
 The crew of the Coast Guard Cutter Stratton from Alameda apprehended four suspected smugglers and seized 275 bales of cocaine worth more than $181 million wholesale from the self-propelled semi-submersible. A U.S. Navy maritime patrol aircraft detected the 40-foot semi-submersible vessel more than 200-miles south of Mexico. 
 
 “Our success intercepting this drug-laden, self-propelled semi-submersible is a testament to the collaboration of our partner agencies, and demonstrates the importance of our increased presence in the Western Hemisphere,” said Vice Adm. Charles W. Ray, commander, Pacific Area. “Every interception of these semi-submersibles disrupts transnational organized crime networks and helps increase security and stability in the Western Hemisphere.” 
 
 After removing 14,000 pounds of the narcotics aboard, the crew of Stratton attempted to tow the vessel to shore as evidence; however, the semi-submersible began taking on water and sank. Approximately 2,000 pounds of cocaine left in the SPSS vessel to stabilize it during the towing evolution sank in over 13,000-feet of water and is unrecoverable. 
 
 The crew of the Cutter Stratton interdicted or disrupted 15 different drug smuggling attempts since April including another self-propelled semi-submersible vessel carrying 5,460 pounds of cocaine June 16. Coast Guardsmen aboard Stratton have seized more than 33,000 pounds of cocaine worth more than $540 million wholesale since May 2015. 
 
 The July 18 semi-submersible seizure is the largest recorded semi-submersible interdiction in Coast Guard history. Stratton’s semi-submersible busts are also the first and second by a Legend Class Cutter, the Coast Guard’s newest and most capable vessels. 
 
 This is the first interdiction of two semi-submersibles in a single patrol at sea where Coast Guardsmen recovered both the narcotics and the vessels. Coast Guardsmen from the Cutter Mohawk from Key West, Florida, interdicted two semisubmersibles in the Caribbean in 2011; however, both vessels sank during the course of the interdiction. 
 
 There have been 25 known semi-submersible interdictions in the Eastern Pacific Ocean since November 2006 when the first documented interdiction occurred. A semi-submersible is a vessel constructed for illicit trafficking that is mostly submerged with just a cockpit and exhaust pipe visible above water. These vessels are extremely difficult to detect and interdict because of their low-profile and ability to scuttle. 
 
 U.S. Customs and Border Protection Office of Air and Marine also assisted by monitoring the semi-submersible using a maritime patrol aircraft during the course of the interdiction July 18. 
 
 Transnational Organized Networks in the Western Hemisphere draw immense profits from drug trafficking, terrorism, human smuggling, weapons trafficking, piracy, environmental crime, intellectual property theft, and cyber-crime. As these well funded illicit networks broaden their activities, they could become mechanisms to be employed by terrorist organizations located in Central and South America. 
 
 The Coast Guard’s leadership role in Western Hemisphere security and prosperity is critical in the fight against TOCs active in the Western Hemisphere as continually strained national security resources are stretched across the globe. 
 
 Video of the interdiction can be found at https://www.dvidshub.net/video/418232/us-agencies-stop-semi-submersible-seize-12000-pounds-cocaine 
 
 A Coast Guard Cutter Stratton boarding team opens the bridge of a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015. The Stratton’s crew recovered more than 6 tons of cocaine from the 40-foot vessel. (Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone) 
 
 A Coast Guard Cutter Stratton boarding team investigates a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015. The Stratton’s crew recovered more than 6 tons of cocaine from the 40-foot vessel. (Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone) 
 
 A Coast Guard Cutter Stratton boarding team member inspects the bridge of a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015. The Stratton’s crew recovered more than six tons of cocaine from the 40-foot vessel. (Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone) 
 
 A Coast Guard Cutter Stratton boarding team investigates a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015. The Stratton’s crew recovered more than 6 tons of cocaine from the 40-foot vessel. (Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone) 
 
 A Coast Guard Cutter Stratton boarding team investigates a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015. The Stratton’s crew recovered more than 6 tons of cocaine from the 40-foot vessel. (Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone) 
 
 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) 
 
 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) 
 
 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) 
 
 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) 
 
 A Coast Guard Cutter Stratton boarding team investigates a self-propelled semi-submersible interdicted in international waters off the coast of Central America, July 19, 2015. The Stratton’s crew recovered more than 6 tons of cocaine from the 40-foot vessel. (Coast Guard photo courtesy of Petty Officer 2nd Class LaNola Stone) 
 
 Coast Guard Cutter Stratton interdiction of Self-Propelled Semi Submersible (SPSS) in the Eastern Pacific, July 18, 2015 (off load July 19, 2015). (U.S. Coast Guard photo by Petty Officer 2nd class LaNola Stone) 
 
 Coast Guard Cutter Stratton crewmembers secure 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)
– A Coast Guard ship seized a semi-submersible vessel carrying 16,000 pounds of cocaine worth more than $180 million last month in what the Coast Guard is calling the largest drug bust of its kind. Even if they did lose two tons of the drug on the way home. The bust was carried out by the California-based Coast Guard cutter Stratton after a Navy aircraft spotted the suspicious vessel about 200 miles south of Mexico. Coast Guard crew members boarded the sub and arrested four suspected smugglers. The Los Angeles Times describes a semi-submersible vessel as a low-tech submarine that travels with only its cockpit and exhaust pipe above water. They are reportedly hard to detect and dangerous to operate. Mashable reports that a quarter of the seized cocaine was lost after the crew of the Stratton left it aboard the semi-submersible for stabilization while towing the vessel to shore. It didn't work: The vessel, and the drugs, sank. Though it gave 4,000 pounds of coke a watery grave, the Stratton has seized more than 33,000 pounds of narcotics since May, says the Coast Guard. (This woman tried to smuggle liquid cocaine in a most unusual way.)