The Infiltrators side quest in Atomfall immerses players in the intrigue of locating Soviet agents concealed within a quarantine zone. Although the quest is not laden with extensive lore, it subtly hints at potential escape routes from this perilous area. Players can also gather valuable loot throughout this mission, which is especially advantageous for those navigating the early stages of the game. Completing the quest yields rewards that enhance your gameplay experience.
This comprehensive guide serves as a step-by-step walkthrough to help you successfully navigate the Infiltrators side quest in Atomfall.
Walkthrough for the Infiltrators Side Quest in Atomfall
Unlike traditional quests with predefined objectives, Atomfall requires players to explore and piece together clues to trigger various missions. The Infiltrators quest is accessible early in the gameplay, and here’s how to embark on this adventure:
Step 1: Visit the Helicopter Crash Site

Step 2: Proceed to the Railyard Location

- Sticky Bomb Recipe
- MK. VI Revolver (Rusty)
- Ammunition
Step 3: Locate the Cellar Entrance in Casterfell Woods

Next, navigate to Casterfell Woods (26.9 E, 90.6 N). Look for a house and approach its rear to discover the cellar entrance. Inside, explore for some crucial notes.
- On your right, there is a narrow area to squeeze through, which contains two notes revealing details about another agent’s whereabouts.
- In the final room, you’ll find another note that provides vital information regarding the location of a fellow agent.
Step 4: Meet Ilya Kozlov

Your next destination is the Skethermoor region, specifically Brinsop Manor (coordinates: 39.4 E, 77.5 N). Enter the dilapidated house and proceed to the back to find another cellar entrance. Here, you will encounter Ilya Kozlov, the last remaining Soviet agent.
Step 5: Assist Ilya Kozlov
Kozlov possesses a miniature high-powered radio but requires components to fix it. He will request:
- 10 bits of scrap metal
- 4 tubes of glue
These items are commonly found in the game; you may already have them. If not, search the surrounding areas and return to deliver the supplies.
Upon repair, Kozlov reveals that the radio could offer a way out of the quarantine zone. He will also disclose the reasons behind the presence of the Soviet agents. After acknowledging the need for time to mend the radio, he will ask you to check back later.
- A grenade
- Pistol ammunition

Step 7: Return to Brinsop Manor Cellar
Upon returning after some time, you will find Kozlov has vanished. He leaves behind a note explaining that the radio could not overcome the interference field, prompting him to seek alternative escape routes.
With that, your mission is complete!
This concludes the essential details about the Infiltrators side quest in Atomfall. Happy gaming!