Explore the underground world of drug smuggling and the sophisticated methods cartels are using to import narcotics. When the war on drugs began to shut down trafficking routes across the globe, smugglers were forced to become more inventive. Now they operate like well-organised corporations, complete with state-of-the-art research and development departments, which are always looking for the next big thing. Anything from submarines to super tunnels, ultralights and fast boats, drug traffickers have no limits to the drastic measures they will take to make a profit. Their multiple inventions all have one main goal – to get the drugs out of the source country and into the US.