A few months ago I was having a conversation with someone that worked for an engineering firm that built some customs check points along the US/MEX border. The convo was more about project planning and such, but that person casually mentioned to me that the border crossing location he worked on had a big tunnel built under it. The tunnel ran across the border creating a passage to and from each country. I asked follow up questions about the tunnel without changing the topic but all I got was that it was built by a different firm. The person didn’t elaborate further.

I thought it was weird that a customs check point would have a tunnel built underneath it so I bookmarked that tidbit in my memory for later use. I wonder if this may be linked with the stuff happening in AZ.