Investigating the murder mystery in Disco Elysium requires patience, keen observation, and thorough forensic analysis across Martinaise. Tracking down trajectory lines and ballistics leads detective Harry Du Bois to several critical locations around the district. Among these locations, finding the island bullet traces serves as a final piece in confirming where the fatal shot originated.

Understanding the Ballistics Questline

The quest to determine the origin of the shot begins after inspecting the victim's body and performing visual calculus checks. Detectives must establish potential firing angles from surrounding landmarks across the harbor area. This forensic endeavor eventually points toward three primary locations: Land's End, the boardwalk area near the Feld building, and the distant sea fort island.

Many players attempt to visit the sea fort early in their playthrough, only to find the path blocked. Progression through the main story is mandatory before accessing the watercraft required to reach the offshore location. Patience is key, as key story events must unfold before the island becomes reachable.

Reaching the Island in the Late Game

Access to the island opens up during the endgame sequence after completing major narrative encounters in Martinaise. Once the skiff is secured, players can travel across the bay to explore the abandoned military fortifications. The area is mostly linear, allowing players to navigate through ruined corridors and outdoor paths.

As you explore the island structure, you will encounter remnants of past conflicts alongside key narrative clues. Preparing your perception skills and equipping lighting equipment like the flashlight ensures you do not miss hidden interactables. Thoroughly checking each room brings you closer to discovering the sniper's vantage point.

Locating the Island Bullet Traces

To locate the exact bullet trace on the island, head toward the dilapidated structure past the main bunker complex. Inside this ruined building, search near the sleeping area and inspect the surrounding floor and walls. Interacting with the mattress and nearby window frame reveals the physical evidence left behind by the shooter.

Examining this final location updates your task log and completes the ballistics investigation. The discovery provides undeniable proof regarding the trajectory and identity of the true culprit. Resolving this detail provides full clarity on how the tragic event occurred.

Tips for a Successful Forensic Investigation

Before traveling to the island, ensure you have thoroughly examined the previous trajectory points at Land's End and under the Feld building. High scores in Visual Calculus, Perception, and Shivers make detecting passive skill checks significantly easier throughout the investigation. Taking your time to analyze each clue guarantees a complete understanding of the narrative mystery.