Go to the dock to find Wu Zhuo's plot, then go back to the gate of Xinling, meet with him, and suppress Liu's plot. Then you can go to someone's room and enter the tunnel from there.

Next:

On the way back to Ling to find Zhao Ya, Ji He visited an empty place. Ji Yang Xiyan was very interested in Shao Long's point of view. She used this battle to test Shao Long's ability and defeat her. Ji was full of admiration and handed over the map of the basement. Go back to the entrance of the basement. You can go down now and get the secret book of Duke Lu from the top left-left-up. ...

See this post for all raiders.

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There are common problems, look carefully.