I got bug when enter the sewers at part 5 I go underground so I cant continue my story line any admin can fix this bug its story line ….
If you haven’t already, make sure to submit a petition in game (via the help interface or by entering /petition in chat and make sure to click submit petition after it brings up the suggested advice too!).
The GMs in game can advance the mission for you in cases of bugs like this - often even if you’re not online at the time.
And make sure you meet the level requirements there to complete the Sewer portion of the mission. You can get there a lot earlier than the required level.