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[–] NACHTJAGD 0 points 7 points (+7|-0) ago 

Not going to give you specifics, but there's a cable at the base of the concrete foundation attached to the metal and the metal rod within the concrete within the concrete filled beam going all the way up.

It detects vibrations below [digging] a certain double figure feet depth and will detect heavy machinery driving on the border road or actual attempts at trying to tamper with the barrier such as vehicles trying to push against the barrier or try to cut or drill through the steel or concrete with power tools. New sections require time to be connected to the command centers. New section of walls are often hollow and they get the concrete filler within the beam poured in later.