The Colombian navy intercepted "narco subs" containing at least 225 metric tons of cocaine as they headed from South America to Australia.

Altogether, the subs contained more than 1,400 tons of illicit drugs, including 225 tons of cocaine and 128 tons of marijuana, CBS News reports. “This is perhaps the largest seizure of cocaine in transit made by Colombia in history,

Colombian authorities have struck a major blow against international drug trafficking. In a six-week operation involving 62 countries, 1,400 tonnes of drugs worth around £6.7 billion were seized. A particular success was the interception of six 'narco-submarines' capable of carrying up to ten tonnes of cocaine.