A submarine with two dead bodies and nearly three tons of cocaine aboard was seized in the Pacific Ocean off the coast of Colombia, the country’s navy announced Sunday. Two survivors “in poor health” were also found on the vessel and given first aid.

“These people’s poor health state is presumably due to the inhalation of toxic fumes caused by fuel problems inside the boat,” Captain Cristian Andres Guzman Echeverry said in a video released by the navy.

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The roughly 50-foot-long submarine was carrying almost 5,800 pounds of cocaine, worth more than $87 million, officials said. The navy said the vessel had been bound for countries in Central America, and that the seizure had kept more than 6 million doses of cocaine off the illegal market.

Read more: CBS