A submarine filled with 4,000 kilograms — approximately 4.5 tons — of cocaine and piloted by four criminals was discovered off the Pacific coast of Colombia. 

Officials conducting a search mission for two missing fishermen stumbled upon the illicit submarine craft on Wednesday, dubbed the "narco sub." 

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Colombia Narco Submarine Cocaine

Colombian authorities raided the 50-foot-long "narco sub" after stumbling across the illicit vessel during a search for a missing fisherman. The Colombian navy published a video documenting the operation on their social media accounts. ( Fuerza Naval del Pacífico)

The underwater vehicle was intercepted by the Colombian navy and air force, as well as the navy of neighboring Ecuador

"With this seizure, the entry of more than $137 million into drug trafficking organizations was prevented, as well as the marketing of more than 10 million doses on the streets of the world," the Colombian navy said.

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Cocaine on display

Authorities in Colombia test substances found in the "narco sub" for cocaine after arresting four suspects for drug trafficking in the Pacific Ocean. The drugs are speculated to amount to over 10 million doses and $137 million worth of substance. Colombian and Ecuadorian naval units contributed to the operation. ( Fuerza Naval del Pacífico)

The 50-foot-long submarine contained 205 packages of substances that tested positive for cocaine. Authorities say the drugs were arranged in packages of all shapes and sizes.

Four individuals were aboard the vessel and arrested when the 4.5 tons of cocaine were seized. 

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Colombia Narco Submarine Cocaine

Colombian authorities transport hundreds of packages containing cocaine from the illegal submarine found off the Pacific coast. Over 4.5 tons of illicit substances were recovered from the illegal submersible vessel, officials said. ( Fuerza Naval del Pacífico)

The Colombian navy published a video documenting the anti-trafficking operation on their social media accounts.

The search for the missing fishermen continues, with authorities saying they were last known to be in a canoe-style boat off the Pacific coast.