They don't pour the concrete, DarkPulse makes the electronic surveillance that detects breaches in all kinds of things
Might want to start here to begin your learning of how DarkPulse Tech can, and likely will, be involved in the Trump wall and many other global smart city, smart nation projects: http://www.darkpulse.com/
Yes and I am sure that NDA'S allow them to give the average citizen that type of info, especially a company that is in the running to be a part of it. lmao.