Cross the sewers to the park | Act 2 - Ghost of Sarajevo Sniper: GW2 Guide
Last update: 11 May 2016
After eliminating all the enemies, get out of the building and head to the large hole in the ground which leads to the sewers.
You will come across two speaking soldiers - wait a bit for them to split and start following them. You can get the first one by the fuse box - kill him silently.
The second one can be found in the corridor by the gate, by the branching on the left. After killing him, head to the other side - you will come across a red door. Jump onto the wall on the right and crawl further.
After jumping back on the ground, head right along the corridor which will lead you to the surface.