C441 An ancient drain

He walked along the sewer and entered the old city area. There was sewage in the sewer, which was the city's living sewage. It was a thick black stench. Xia Lei was alright, but Tang Yuyan and Long Bing couldn't take it anymore.

"How much longer?" Tang Yuyan frowned, "Are you sure this is the right path?"

Long Bing also said, "This drainage system was obviously built in the modern era