Battle for Avdiivka: Russian forces enter into AFU reinforced concrete trenches

This is what Russian soldiers are hacking now, there is no more fortified place on the entire front.Ukrainian army built this fortification non-stop for 9 years, all important strategic positions were poured into reinforced concrete, a whole network of fortifications was dug into the ground, a significant part of them are united by passages, trenches, there are underground tunnels, these allow you to survive even heavy shelling, the visible above-ground parts of the dugouts are welded anti-cumulative grilles for protection against anti-tank missiles.
The entire perimeter is hung with CCTV cameras and motion sensors.