As previously mentioned, the drug cartels in Colombia are increasingly turning to the high seas to transport their product by building submarines that are difficult to detect by sonar.

From National Public Radio:

With huge profits as the lure, drug traffickers in Colombia use every possible method to ship their cocaine to market. And, if the latest trend is any sign, they’re as ingenious as ever.

Colombia’s navy has been detecting the increasing use of submarines to transport tons of cocaine.

Colombian and American authorities stopped 13 vessels in 2007, more vessels then all the years since 1993 combined.

FARC earns between $500 million to $1 billion in drug sales.

[Global Guerrillas]