Chapter Four: The Last Train Without Passengers

His screen woke by itself and displayed the tunnel's projected probability of collapse within seven days: 99.83 percent. The maintenance car would enter at 12:20. There would be no survivors. Xu Cheng stared at the projection. “The car won't be empty. I'm taking four temporary workers next week. They're not registered in the system.” No passengers meant only that none of them had been recorded by the city. Zhou Yu called the transit authority and had the tunnel closed. Before dawn, engineers discovered an enormous cavity washed out by groundwater behind the east wall. When the notice appeared—“Outcome changed”—Shen Yan gripped the railing in advance. Xu Zhen's memory took him anyway.