in MarathonThe Return on Investment 2 The contract requires you to break into a secure building near Maintenance to steal explosive supplies before using them on unsuspecting victims. Part of the Traxus Priority Contract series, this mission is fairly simple if you know how to use an explosive device. In this Marathon Guide, we go over where to get explosive supplies and how to rack up enough explosive damage in the same round.
How to Complete Return on Investment 2 in Marathon
Get explosives
To get explosives, you need to head Southwest aspect of maintenance at Dyer Marsh. You should see a small white and red building attached to an elevated catwalk. If you can see Green lasers on all windowsYou will know you are in the right place. Approach the building, but don't go inside yet.
Those green lasers are actually security sensors that, when tripped, will activate the alarm and seal you inside. Not only could it attract a lot of unwanted attention from nearby UESC and runners, but the building itself Loaded with live claymores. Any wrong move while in panic can send you to an early grave.
Thankfully, there is a safe way to enter the building. Take a look through each window until you find it Safety breaker boxes protruding from the wall. There are two of them in the building; One on the first floor, and one on the second, and both of them have separate red lights. Shoot each one until they are destroyed, which will disable the security system and allow you to climb inside undetected. again, Look for claymores on the floor.
Find the yellow and orange explosive container on the second floor and loot the grenades from it. Now, you need to find some victims to deal explosive damage.
Deals 750 explosive damage
The next phase involves dealing explosive damage to UESC robots or enemy runners. While you can choose to target runners, it's much easier and more reliable to just go for the UESC robots instead.
A simple way to rack up quick explosive damage Find examples where UESC robots are grouped together. This can happen through natural events, such as UESC dropships appearing, or through events you trigger yourself. Some events that cause UESC to either fall or spawn closely together are:
-
Protected Exfils
-
Container Hacks
-
Proximity sensors (usually found in repairs)
Explosive damage isn't limited to the devices found in the explosive supply box, and you're free to use any extra grenades you find or bring yourself to complete the task.
Fortunately, Return on Investment 2 doesn't have to be completed in a single run, and any explosive damage accumulated carries over to your next run if you don't hit the mark the first time. If you still have room on your list, use our Dyer Marsh interactive map to find all the best spots to loot before heading out.
All rewards to complete return on investment 2
Being a priority deal, Return on Investment 2 will give you some hefty rewards upon completion. In addition to 420 Traxus reputation points, you will receive:
-
Deluxe Bully SMG
-
(70) Heavy ammunition
-
(1) Irregular Enhanced grip mode
-
(2) Irregular Sophisticated liberation
-
2,000 credits
Looking for your new favorite weapon? Check out our Marathon Weapons Tier List for the best guns to grab on Tau Ceti IV.
- issued
-
March 5, 2026
- ESRB
-
Juvenile/animated blood, language, violence, in-game purchases, user interaction
- Multiplayer
-
Online multiplayer, online co-op
