Reaching the sea fortress island in Disco Elysium marks the dramatic climax of Detective Harry Du Bois's central murder investigation. Players must complete crucial prerequisite storyline beats in Revachol West before the option to set sail becomes available. Understanding the exact sequence of events ensures you do not miss vital clues before taking the final voyage.
Complete the FELD Building Investigation and Ruby Encounter
Before you can journey to the island, you must progress the main storyline by locating the fugitive Ruby. This requires investigating the abandoned FELD R&D building located in the northern area past the fishing village. Confronting Ruby triggers pivotal revelations about the case and sets up the game's turning point.
Passing the necessary skill checks inside the facility allows you to uncover the truth behind the murder weapon's trajectory. Once this confrontation concludes, returning to central Martinaise initiates the dramatic confrontation outside the Whirling-in-Rags.
Survive the Mercenary Tribunal
The Mercenary Tribunal is an unmissable major event that alters the state of Martinaise and its residents. Your choices during this intense standoff determine the fate of several key characters and your active partner. Regardless of the immediate outcome, surviving this crisis is mandatory to unlock the final act.
After recovering from the aftermath of the shootout, you will regain control of Harry in his room. Taking time to inspect the surroundings and speak with your companion helps establish the next logical step in the case.
Deduce the True Bullet Trajectory
To pinpoint the island as your destination, you must inspect Klaasje's room and her roof balcony once more. Examining the window frame and tracing the trajectory path confirms the fatal shot originated from across the bay. This critical realization updates your task log with the goal of finding water transportation.
Without establishing this ballistics connection, the option to request a vessel will remain unavailable. Make sure to exhaust all dialogue options regarding the bullet path with your partner before heading toward the coast.
Borrow the Boat from Lilienne in the Fishing Village
Head south toward the fishing village and locate Lilienne, the net-picker sitting near the shacks. Speaking with her about the ongoing investigation unlocks the dialogue option to borrow her motorized skiff. She generously grants permission to use the boat docked along the wooden pier.
Walk down to the edge of the dock and interact directly with the small vessel to depart. Boarding the skiff initiates the point of no return, transporting you directly to the island for the final confrontation.
