- Primary Subject: Marathon
- Key Update: Completing the mission unlocks the Sekiguchi Genetics faction and its upgrades
- Status: Confirmed
- Last Verified: March 11, 2026
- Quick Answer: To complete the Introducing Sekiguchi contract in Marathon, inject the Necrotic Sample in the Flight Control building, scan your shell in the Orientation building, and successfully extract from the Outpost raid.
The Introducing Sekiguchi contract is one of the key progression missions in Marathon because it unlocks the Sekiguchi Genetics faction, a biotechnology corporation known for enhancing Runner shells with specialized upgrades.
This contract serves as the introduction to the faction and must be completed before players can access its technology and additional assignments.
While the objectives themselves are simple, the mission can be difficult because both tasks must be completed during the same raid on the Outpost map, which is considered one of the more dangerous locations in the game.
What Do You Need Before Starting the Introducing Sekiguchi Contract?
Before attempting the contract, players must first meet the progression requirement that unlocks Outpost as an available map.
.webp?width=700&quality=10&blur=40)
This typically happens after reaching the appropriate season level and completing earlier faction tasks. Once
Outpost becomes accessible, the Introducing Sekiguchi contract will direct players to complete two objectives located in different sections of the map.
Outpost’s tight environment means players will often encounter hostile UESC forces, Heat Cascade hazards, and enemy Runners.
Bringing healing supplies, shields, and reliable weapons will significantly improve your chances of completing the contract in a single run.
Where Do You Inject the Necrotic Sample in Marathon?
Once the contract is activated, players must complete the first objective by injecting a Necrotic Sample inside the Flight Control building, a large multi-floor structure in the northern area of the Outpost map connected by long corridors.
To reach the objective, head into the building and climb up to the second floor, where numbered markers on the walls can help confirm that you are on the correct level.
Once upstairs, move along the corridor that runs along the southern side of the building. Eventually you will come across a smaller technical room or workshop area branching off from the hallway.
Inside this workshop room, you will find a storage container with glowing indicators. Interacting with the container allows you to search its drawers, where the Necrotic Sample can be found.
As soon as the sample is collected, your Runner automatically injects it into their shell. This completes the first objective but immediately applies a negative status effect that causes periodic damage over time.
As the effect steadily drains your health, you will need to move toward the next objective quickly or use healing items to remain alive while crossing the map.
Where Do You Scan Your Shell in Marathon?
After injecting the sample in Flight Control, head across the Outpost map to the Orientation building in the southeastern Orientation area for the second objective.
Once inside, head up to the second floor, where you will pass through a section containing lockers and a reception-style space. You should also see a small scanning booth placed next to a window nearby.
This booth is the device used to scan your Runner shell. To complete the objective, simply step inside the scanner and remain there while the system performs the scan.
During this process, the booth will analyze the Necrotic Sample that was previously injected into your Runner.
After the scan finishes, the damaging status effect from the injection will be removed, and the second objective of the contract will be completed.
Even after both objectives are finished, the mission is not fully complete until the raid ends successfully. Players must still extract from the Outpost map, which may require traveling to an extraction point guarded by enemies or unlocking an extraction zone using keycards.
Successfully escaping the raid will finalize the contract and reward the player for completing it. After completing the mission, the Sekiguchi faction unlocks, giving players access to new contracts, rewards, and biotechnology upgrades for their Runner.
For more like this, stick with us here at Gfinityesports.com, the best website for gaming guides.