This time the yellow light did not continue along the track. The headlights pressed it down until it was no larger than the size of a hand. It turned sharply to the right and landed on an iron pipe protruding from the side wall of the tunnel. An iron sheet is welded to the lower end of the iron pipe, with a few words written on it in white paint.
Fu Zhenzhen leaned over to look and read out: "033 times, manual confirmation point."
Chen Mo stepped on the brake. The wheels made a sharp sound on the rails. When it came to a stop, the front of the car was less than three meters away from the iron pipe.
He didn't get out of the car immediately. He opened the door and listened for two seconds. There was no wind, no sound of water flowing, and the entire tunnel was as quiet as if it had been evacuated. The yellow light on the iron pipe was on steadily, illuminating an iron door half a person's height on the right side of the track. An old-fashioned switch lock hangs next to the door. Most of the paint on the lock shell has peeled off, revealing the rusty white iron underneath.
