How to download a UESC Comms Security Code in Quarantine in Marathon – Return on Investment 3 contract guide

The Return on Investment 3 contract is a priority task for the Traxus faction to complete in Marathon, and this guide will help you to finish it early on your run. The third Return on Investment contract has three separate tasks to finish. You need to complete all of them on the same run, which makes things slightly dicey. Let's look at how to get all three tasks done.Table of contentsMarathon Return on Investment 3 contract walkthroughHow to download a UESC Comms Security Code in QuarantineHow to defeat and take the credentials from the UESC Commander in MaintenanceHow to Intercept UESC comms at AI Uplink or Bio-ResearchMarathon Return on Investment 3 contract walkthrough The Return on Investment 3 contract can be broken down into three parts.Download a UESC Comms Security Code in QuarantineDefeat and take the credentials from the UESC Commander in MaintenanceIntercept UESC comms at AI Uplink or Bio-ResearchHow to download a UESC Comms Security Code in Quarantine Screenshot and remix by Destructoid The first task takes us to the main building in Quarantine. Reach the spot marked on the image above, and go in through the main entrance. The code can be found in a terminal in a room on the ground floor. Thankfully, if you reach the marked spot, you'll have a quest marker pop up to help you get the code. Image via Bungie Once you find the terminal, interact with it to download the UESC Comms Security Code to finish the first task.How to defeat and take the credentials from the UESC Commander in Maintenance Screenshot and remix by Destructoid This task is relatively easy to locate. Head into the Maintenance from the south entrance, and you'll have a pink quest marker highlighting the location of the UESC Commander. I will advise fighting it from a height since you'll take fewer hits. Once the Commander is taken down, you can find the credentials from his remains.How to Intercept UESC comms at AI Uplink or Bio-Research Screenshot and remix by Destructoid For the last task, you have to head to either AI Uplink or Bio-Research. I chose the former, and you have to reach the top of the catwalk at this location. I have marked the spot, and the quest marker appears quite early when you're at the correct spot. Use the ladders near the catwalk to get on top of the cables (that roof the catwalk), and you'll find the item to intercept. Image via Bungie Complete the last task, and you'll finish the Return on Investment 3 contract. The post How to download a UESC Comms Security Code in Quarantine in Marathon – Return on Investment 3 contract guide appeared first on Destructoid.

Mar 17, 2026 - 18:58

How to download a UESC Comms Security Code in Quarantine in Marathon – Return on Investment 3 contract guide

The Return on Investment 3 contract is a priority task for the Traxus faction to complete in Marathon, and this guide will help you to finish it early on your run.

The third Return on Investment contract has three separate tasks to finish. You need to complete all of them on the same run, which makes things slightly dicey. Let's look at how to get all three tasks done.

Table of contents

Marathon Return on Investment 3 contract walkthrough

Marathon Return on Investment 3 contract walkthrough

The Return on Investment 3 contract can be broken down into three parts.

Download a UESC Comms Security Code in Quarantine
Defeat and take the credentials from the UESC Commander in Maintenance
Intercept UESC comms at AI Uplink or Bio-Research

How to download a UESC Comms Security Code in Quarantine

Screenshot and remix by Destructoid The first task takes us to the main building in Quarantine. Reach the spot marked on the image above, and go in through the main entrance. The code can be found in a terminal in a room on the ground floor. Thankfully, if you reach the marked spot, you'll have a quest marker pop up to help you get the code.

Image via Bungie Once you find the terminal, interact with it to download the UESC Comms Security Code to finish the first task.

How to defeat and take the credentials from the UESC Commander in Maintenance

Screenshot and remix by Destructoid This task is relatively easy to locate. Head into the Maintenance from the south entrance, and you'll have a pink quest marker highlighting the location of the UESC Commander. I will advise fighting it from a height since you'll take fewer hits.

Once the Commander is taken down, you can find the credentials from his remains.

How to Intercept UESC comms at AI Uplink or Bio-Research

Screenshot and remix by Destructoid For the last task, you have to head to either AI Uplink or Bio-Research. I chose the former, and you have to reach the top of the catwalk at this location. I have marked the spot, and the quest marker appears quite early when you're at the correct spot. Use the ladders near the catwalk to get on top of the cables (that roof the catwalk), and you'll find the item to intercept.

Image via Bungie Complete the last task, and you'll finish the Return on Investment 3 contract.

The post How to download a UESC Comms Security Code in Quarantine in Marathon – Return on Investment 3 contract guide appeared first on Destructoid.

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