The sewage treatment plant was all automated machinery; there were only two people on duty in the security room at night. It didn't take Ling Chen much time to easily bypass the surveillance and infiltrate the interior of the sewage plant.
Finding the sewage pipe that led directly to the target factory, Ling Chen put on night vision goggles, adjusted the signal of his headset, and then crawled into the sewage pipe. The diameter of the pipe was half a meter long, just enough to accommodate an adult.
However, the pipe emitted a pungent stench, and its inside was coated with sticky filth, which was very disgusting.
Fortunately, Ling Chen was prepared in advance, wearing a mask and gloves, and moved slowly along the sewage pipe. This pipe was over four hundred meters long, and he could only crawl on hands and knees, carrying tools on his back, which was very laborious. It was undoubtedly a serious test of his stamina.
