Hash (S02E02)

Smuggling hashish from the remote Moroccan Riff Mountains to the streets of Europe is a dirty, dangerous business. A former British gangster serves as guide into this illicit underworld, visiting a secret hash-making location nestled in the mountains. Using everything from hidden car compartments and donkeys to skis and drug mules, the smugglers' key is to be as inconspicuous as possible. At the front line of Europe's war on drugs, customs agents near Gibraltar seize 100 kilograms of hashish. (National Geographic)