This sequel to Hull Breach is an optional quest triggered when you speak to the Mariner after Living on the Edge. It will take you to the MS Azalea, a Trapper homestead built on an old ship.
Find and kill Bilge to complete the task of clearing Trappers. Clearing the area of the remaining Trappers is optional. Search the sprawling remains of the ship for a bevy of medical supplies and ammo before you leave. Check the tower for a locked safe and a Vault Tec Lunchbox.
Return to the Mariner to complete the quest and collect a caps reward.