What should I do if Dan Heng, the main line of the iron collapse, doesn't leave?

1. When entering the challenge, it is better to talk to the Soviet businessmen at the initial position and unlock the Fu Ling. The new soldiers cross the Liuyundu to meet the train group.

2. After reaching the target position and completing the drawing, find the second control device and move it to the left.

3. Find the navigation compass as shown in the figure according to the task description, and then turn the pointer.

4. If you choose to leave Liuyundu, you can complete the story task challenge of Dan Heng.