From Chaotianmen to the Zoo, there is a direct subway in Chongqing. You can choose to take Metro Line 1. Metro Line 1 departs from Chaotianmen Station and takes about 40 minutes to get to Zoo Station. The specific time will vary depending on the train operation on the day. Please note that timetables and route information may be subject to adjustment. It is best to check the latest traffic information before traveling.