The Wall is an enormous structure, as tall as a skyscraper and hundreds of yards thick. The Wall surrounds the city of Los Angeles, California.
It was installed during the night of The Arrival, sections of The Wall were flown in and put in place, crushing any structures that were in the way.
The Wall is filled with countless drones that patrol the area and eliminate intruders. The drones appear to communicate and resistance members believe them to be exchanging a coded countdown that will end when the population of Los Angeles is eliminated. Despite the danger of the drones, there appear to be areas on the Wall where the security is not as high and there exist smugglers who have developed techniques to scale the wall.
Automated Installation of Gateway Walls