Border defences, whether in an insurgency - Algeria and Rhodesia come to mind - or to control border crossing are often controversial:
In related news, Turkey has completed construction of a 764-km (475 mile) concrete wall along its border with Syria. Ankara launched the construction project in 2015 for a barrier along 826 of the 911 kms of the border. The modular walls consisted of seven-ton mobile blocks, two meters wide and three meters high, topped with a one-meter height of razor wire. A furhter electronic layer has close-up surveillance systems, thermal cameras, land surveillance radar, remote-controlled weapons systems, command-and-control centers, line-length imaging systems and seismic and acoustic sensors. There is also laser destructive fiber-optic detection, surveillance radar for drone detection, jammers, and sensor-triggered short distance lighting systems.
Link:http://eaworldview.com/2018/06/syria...investigation/