i put this to ivan ali.ing in now to colombia is very hard line and is saying the peace deal is too soft, do you worry about the future? is there any chance that colombia could go back to war? we're a long way from the coca fields of the amazon jungle. this is cartagena, on colombia's northern caribbean coast, a gateway to the us and the global cocaine market. i'm being shown the state—of—the—art equipment that enables the authorities to monitor every single item of freight leaving this terminal. the police told me this is one of the most secure container terminals in the world, almost impossible to smuggle drugs from. the navy told me a different story. the colombian navy say that this island, just off cartagena harbour, is absolutely key to the cartels getting their shipments out of colombia. what they say is that they use the local population here to transfer their drugs from the mainland, and then put them onto the container ships at night. captainjulian cuartas knows exactly how it works. they use small