Living on the Edge

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

Detailed walkthrough
Living on the Edge is the first of two overarching Harbormen quests. It has no actual target itself, but serves as a checklist for a number of different Far Harbor side quests instead.
 * (Optional) Help Cassie Dalton starts the quest Blood Tide.
 * (Optional) Help the Mariner starts the first part of the Hull Breach questline.
 * (Optional) Help Captain Avery starts the quest Safe Passage.
 * (Optional) Help the Mariner again starts the second part of the Hull Breach questline.

Finishing any of these quests also marks the respective optional task of Living on the Edge as complete. Once all active optional tasks are completed, Living on the Edge will be considered finished as well, resulting in gaining the appropriate reward in XP.