Safe Passage

 is a freeform quest in the Fallout 4 add-on Far Harbor.

Synopsis
Captain Avery in Far Harbor is concerned because the Fog Condensers that protect the road to a nearby water purifier aren't working. She asks the player to find Howard Dunbar, who she sent out to make the repairs.

Walkthrough

 * 1) Head out to the ruins of the town and look for Dunbar behind a ruined building to the northwest of Beaver Creek Lanes. Pick up the fog condenser parts off of his corpse.
 * 2) Use them on the three fog condensers along the line leading out of the town, towards the lake.
 * 3) Once the third one is installed, a legendary mirelurk will take offense. Kill it.
 * 4) Return to Captain Avery to claim your reward. 200 caps, but you can persuade her to pay more: Up to 400 caps.