All in all, it's just another post on the wall

[Black Aeronaut]

I often like to point out to people that narco tunnels are a thing that exist, and the cartels have gotten very good at not only hiding them, but building them as well.  Most are about a thousand or so feet long, though I'm sure I've heard of one or two that have been recorded at being over a mile in length.  And they can move hundreds of kilos of cocaine, marijuana, and even illegal immigrants, in a single day since they don't need to worry about hiding under cover of darkness.  They just place the tunnel entrances within existing buildings - usually inside industrial areas along the border where no one is going to notice any digging.

https://www.businessinsider.com/inside-m...der-2016-4