So there is a border between US and Mexico. There were only two ways to get illegal things – be it drugs, guns or even people – across the border. Drive thru (and risk getting caught) or construct a tunnel (which is expensive and once found, you end up losing the entire ‘investment’)
What is the alternative ? The drug dealers went for some old technology – build cannons and shoot drugs into the US from Mexico.
For full story, read here: