How to scan the secured containers in Algae Ponds basement in Marathon – Return on Investment 1 contract guide

The Return on Investment 1 contract is a priority task from the Traxus faction that takes place on the Dire Marsh map in Marathon. Unlike most contracts available in the game, Return on Investment 1 has just one task in reality. However, there's a bit of exploration to be done, and this guide will help you figure out what you're looking for. Once done, you'll also need to exfil successfully to complete the contract. Table of contentsMarathon Return on Investment 1 contract walkthroughHow to scan the secured containers in Algae Ponds basementMarathon Return on Investment 1 contract walkthrough Here are the two tasks that are part of the first Return on Investment contract. Scan the secured containers in Algae Ponds basementExfilHow to scan the secured containers in Algae Ponds basement Screenshot and remix by Destructoid For this task, head to the Algae Ponds location on Dire Marsh. You'll come across the main building (refer to the image below), but don't enter it. Instead, enter the small building opposite it. Head inside, and go towards the end. You'll find a small door that you'll need to crawl through. Image via Bungie If you're confused about what the doorway looks like, refer to the image below. Go through, and you'll find a ladder to drop down. You can also access this ladder from the roof of the building if you seek an alternate route. Image via Bungie Use the ladder, drop down, and you'll find four containers at the location to scan. There's no correct order for scanning the containers. All four containers are at the same location, and they will be highlighted by the quest marker. Complete the scans for all four, and the first task will be done. Image via Bungie The only thing left will be to exfil successfully. If you fail to exfil, you'll need to restart the contract from the start. On my run, UESC enemies popped up when I completed the scan. I am unsure if this is random (my friend didn't face the same problem), but it's best to prepare for incoming fire either way. The post How to scan the secured containers in Algae Ponds basement in Marathon – Return on Investment 1 contract guide appeared first on Destructoid.

Mar 10, 2026 - 18:46

How to scan the secured containers in Algae Ponds basement in Marathon – Return on Investment 1 contract guide

The Return on Investment 1 contract is a priority task from the Traxus faction that takes place on the Dire Marsh map in Marathon.

Unlike most contracts available in the game, Return on Investment 1 has just one task in reality. However, there's a bit of exploration to be done, and this guide will help you figure out what you're looking for. Once done, you'll also need to exfil successfully to complete the contract.

Table of contents

Marathon Return on Investment 1 contract walkthrough
- How to scan the secured containers in Algae Ponds basement

Marathon Return on Investment 1 contract walkthrough

Here are the two tasks that are part of the first Return on Investment contract.

Scan the secured containers in Algae Ponds basement
Exfil

How to scan the secured containers in Algae Ponds basement

Screenshot and remix by Destructoid For this task, head to the Algae Ponds location on Dire Marsh. You'll come across the main building (refer to the image below), but don't enter it. Instead, enter the small building opposite it. Head inside, and go towards the end. You'll find a small door that you'll need to crawl through.

Image via Bungie If you're confused about what the doorway looks like, refer to the image below. Go through, and you'll find a ladder to drop down. You can also access this ladder from the roof of the building if you seek an alternate route.

Image via Bungie Use the ladder, drop down, and you'll find four containers at the location to scan. There's no correct order for scanning the containers. All four containers are at the same location, and they will be highlighted by the quest marker. Complete the scans for all four, and the first task will be done.

Image via Bungie The only thing left will be to exfil successfully. If you fail to exfil, you'll need to restart the contract from the start. On my run, UESC enemies popped up when I completed the scan. I am unsure if this is random (my friend didn't face the same problem), but it's best to prepare for incoming fire either way.

The post How to scan the secured containers in Algae Ponds basement in Marathon – Return on Investment 1 contract guide appeared first on Destructoid.

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