Along the hike from the Caribbean coast to the Ciudad Perdida "The Lost City" in the jungle clad mountains of the Sierra Nevada we visited a cocaine lab run by a coca farmer. How do you make cocaine? Take some coca leaves, a number of nasty substances, add some bullets, some scary paramilitary soldiers, a dash of guerrillas, some corrupt cops and a pinch of coca farmer, and you’ve got one of the world's deadliest drug ***tails.