The concept of using submarines for drug smuggling emerged in the 1990s, with initial sightings reported in Colombia. Early versions were rudimentary, often referred to as "semi-submersibles ...

Media reports said one of the six semi-submersible vessels — or "narco submarines" — intercepted in the operation was bound for Australia, but was stopped 2,000 kilometres southwest of ...

A security source told AFP the narco-submarines had initially been used to transfer drugs out of Colombia and on to ships off the coast. “It has been found that these semi-submersibles ...