Israel on Tuesday announced the completion of a sensor-equipped underground wall on its side of the Gaza border.
The construction of the wall is said to be a counter-measure developed after Hamas militants used tunnels to blindside its troops in the 2014 clash.
Going public with the project in 2016., Israel also revealed an above-ground fence, a naval barrier, radar systems and command and control rooms.
"Today, with the completion of this project, which is mostly hidden, we deprive Hamas of one of the capabilities it tried to develop, and it places an 'iron wall' of sensors and concrete between the terror organization and the residents of the Israel's south."
The defense ministry said the "smart fence" includes hundreds of cameras, radar and other sensors, and spans 65 kilometers across and 6 meters high.
The completion of the fence required the use of 140-thousand tons of iron and steel, and took three and a half years to complete.