Four drug traffickers from Colombia used a makeshift submarine to move cocaine into Mexican waters this week.

The seizure took place near the beach resort area of Huatulco, Oaxaca, when military forces working coast guard operations intercepted the makeshift submarine, the Mexican Navy revealed. A military surveillance aircraft spotted the submarine and coordinated the capture.

Authorities arrested four men identified only as Colombian nationals. Sailors seized the boat and 106 bundles of cocaine. A total weight for the cocaine remains undisclosed. Mexico’s Navy claimed the four suspected drug runners and their equipment would be turned over to the Oaxaca Attorney General’s Office for criminal handling.

Mexico’s southern beaches are commonly used by South American drug traffickers to smuggle large quantities of cocaine–typically bound for the U.S. border. In many cases, particularly in Michoacán and Jalisco, authorities at the local, state and even federal level are complicit in the smuggling operations.

Ildefonso Ortiz is an award-winning journalist with Breitbart Texas. He co-founded Breitbart Texas’ Cartel Chronicles project with Brandon Darby and senior Breitbart management. You can follow him on Twitter and on Facebook. He can be contacted at Iortiz@breitbart.com

Brandon Darby is the managing director and editor-in-chief of Breitbart Texas. He co-founded Breitbart Texas’ Cartel Chronicles project with Ildefonso Ortiz and senior Breitbart management. Follow him on Twitter and Facebook. He can be contacted at bdarby@breitbart.com.