What We Left Behind – Complete Quest Walkthrough for ARC Raiders
“What We Left Behind” is a three-location investigative quest in ARC Raiders that sends you across Buried City, Dam Battlegrounds, and Spaceport to examine abandoned Raider positions. On the surface, the quest appears simple: travel to each map, interact with marked objects, and move on. In practice, however, many players waste time searching the wrong structures, miss required interactables, or expose themselves unnecessarily in high-traffic zones.
This guide explains exactly where to go, what to interact with, how to confirm completion, and how to approach each area safely so you do not turn a straightforward objective into a risky firefight.
Quest Structure and How Progress Works
Unlike extraction-based missions that require you to carry items out of raid, this quest is interaction-driven. Each objective is tied to a specific map and completes immediately once you interact with the correct object and your tracker updates. You do not need to extract a physical quest item.
The quest consists of:
| Step | Map | Objective Type | Completion Trigger |
| 1 | Buried City | Search two Raider containers | Tracker updates after both searches |
| 2 | Dam Battlegrounds | Search marked documents | Tracker updates after document interaction |
| 3 | Spaceport | Search hidden Raider notes | Tracker updates after interaction |
Each step must be completed on its respective map, meaning you will finish the quest across multiple deployments.
Before entering raid, it helps to have a broader understanding of sector layouts and travel lanes. Reviewing the main ARC Raiders map overview can reduce exposure and improve movement efficiency.
Prepare properly before running multi-map quest objectives:
Step 1: Buried City – Raider Camp Beneath the Parking Garage
The first objective takes place in Buried City near Marano Park, specifically inside the Parking Garage structure. Many players search the visible garage floors and fail to realize the quest objective is located underground.
After entering the Parking Garage, move toward the southwest corner of the structure. There you will find a breachable door. Once breached, it leads to a zipline that descends into a buried Raider encampment beneath the garage. This underground room is partially filled with sand and contains makeshift Raider storage.
Inside this lower room, you must search two specific objects:
- A long Raider case
- A smaller bag positioned behind corrugated metal sheets
Both containers must be searched for the objective to register. Searching only one will not complete the step. The quest tracker must visibly update before you leave the area.
This location can attract player traffic due to its central positioning. The safest approach is to enter, complete both searches quickly, confirm tracker progress, and rotate out immediately rather than looting additional containers.
Step 2: Dam Battlegrounds – South Swamp Outpost
The second objective takes place at South Swamp Outpost in Dam Battlegrounds, located on the western side of the map near Water Treatment Control. Unlike Buried City, this step does not require searching containers. Instead, you are looking for a document interaction inside a specific building.
Enter the main cylindrical building at South Swamp Outpost. Inside, you will find documents on a table marked with a yellow interaction icon. Interact fully and wait for the quest tracker to update. This confirms completion of the step.
Players often fail this stage by searching crates instead of the marked documents. Only the specific quest-marked object counts.
South Swamp Outpost sits along common rotation routes. Approach carefully, especially if gunfire is active nearby. Pause outside, observe movement, and enter only when clear. Complete the interaction and leave promptly.
If you plan to revisit Dam Battlegrounds frequently for other quest chains, reviewing movement patterns and safer entry angles can improve consistency.
Step 3: Spaceport – Bilguun’s Hideout
The final objective is located in Spaceport near Container Storage. This is the step that causes the most confusion because the hideout is not at ground level.
Move to the wall east of Container Storage. Walk along the wall until you find a broken section that allows you to climb up. Once on top of the wall, look for a metal Raider camp structure that hangs off the side. Enter this elevated structure and search the yellow-marked notes inside.
The tracker will update immediately after interaction.
Players frequently miss this objective because they search ground-level containers or fail to realize the hideout is elevated. Always confirm the tracker updates before descending.
Because the wall position leaves you exposed against the skyline, minimize the time spent on top. Climb, interact, confirm, and exit efficiently.
For players unfamiliar with Spaceport traversal and wall access routes, reviewing sector layouts can improve approach angles.
Recommended Completion Order
Although the quest does not enforce order, survival efficiency improves when completed strategically.
| Recommended Order | Reason |
| Dam Battlegrounds | Fastest and lowest exposure |
| Spaceport | Moderate risk with quick vertical access |
| Buried City | More central and potentially contested |
By completing lower-risk objectives first, you reduce wasted time and preserve focus for the more exposed Buried City step.
Movement and Survival Strategy
This quest rewards discipline over aggression. The objective is not to clear sectors but to interact with specific objects.
Effective movement includes:
- Using terrain cover when approaching structures
- Avoiding skyline exposure
- Minimizing sprinting near objective zones
- Disengaging from unnecessary combat
If another squad is fighting near your objective, rotate instead of forcing entry. Completing the quest is more important than winning optional engagements.
Upgrade progression after completing quest chains efficiently:
Solo vs Squad Execution
Solo Players
The Solo players should prioritize stealth and speed. Avoid extended fights and focus only on the required interactions. Once the tracker updates, leave immediately.
Squad Players
Squads can assign one player to interact while others hold angles and clear entrances. Maintain cohesion during exit to avoid late engagement.
Common Mistakes and How to Avoid Them
| Mistake | Why It Happens | Prevention |
| Only searching one container in Buried City | Hidden second bag | Double-check underground room |
| Searching crates in Dam | Misunderstanding objective | Look for yellow-marked documents |
| Searching ground level in Spaceport | Not climbing wall | Always check elevated sections |
| Staying to loot | Overconfidence | Leave after tracker update |
FAQ
Do I need to extract with anything?
No. These objectives are interaction-based and complete immediately once the correct object is searched.
Can I finish all three steps in one raid?
No. Each step is tied to a different map, requiring separate deployments.
Why didn’t Buried City count?
You likely missed the second container hidden behind the metal sheets.
Why can’t I find Bilguun’s Hideout?
It is located on top of the wall east of Container Storage, not at ground level.
Final Completion Summary
“What We Left Behind” is not mechanically difficult. It becomes frustrating only when approached without clarity. Once you understand the exact interact points and move with purpose instead of treating it like a loot run, the quest becomes consistent and predictable.
Enter, interact, confirm tracker update, and rotate out. Repeat across the three maps, and the quest completes cleanly without unnecessary risk.
