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Data Reconstruction is a three-part NuCaloric Priority Contract in Marathon. The documented route runs through Perimeter, then Dire Marsh, and back to Perimeter: scan bioprinters, download records, hack data repositories, collect an AI maintenance protocol, and extract. However, Bungie reset Priority Contracts in the October 6, 2026 Nightfall Refresh, so treat the locations below as the earlier documented walkthrough and compare every objective, count, and run requirement with the contract panel currently shown in your game.
The June 2026 update removed faction-rank requirements for Priority Contracts and described broader tuning intended to reduce excessive traversal and single-run demands, but Bungie did not publish Data Reconstruction’s complete post-reset objective text. The safest approach is to use this guide to recognize locations, then follow the live contract for the final authority.
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What is the Data Reconstruction contract in Marathon?
Data Reconstruction is a NuCaloric priority contract split into three stages. Earlier walkthroughs place the stages in this order:
| Stage | Map | Documented objectives | Earlier persistence note |
|---|---|---|---|
| 1 | Perimeter | Two Sparkleaf scans at South Relay; two Fungal scans at Overflow; agriculture report at North Relay | Guides say progress can span multiple runs |
| 2 | Dire Marsh | Harvest logs at Algae Ponds; three data repositories on the AI Uplink catwalk | Guides say either order and multiple runs are allowed |
| 3 | Perimeter | Two exterior repository hacks at North or South Relay; AI maintenance protocol at Hauler; extraction | An older guide says one run, but this is not confirmed after the reset |
Those details come from the February–March 2026 walkthroughs, including the full NuCaloric contract route, the first-stage guide, and separate guides for stages two and three. They are useful for navigation, but they should not override a changed objective in the live contract.
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What should you check before starting?
Open the active Priority Contract panel before launching. Confirm the map, objective wording, required counts, whether progress persists between runs, and whether the final stage explicitly says that all tasks must be completed in one deployment. This matters because Bungie’s October 6, 2026 update reset Priority Contracts, faction levels, and zone access.
- Read the current stage text. Do not assume that “two,” “three,” or “single run” still matches the earlier version.
- Note the map and spawn. The documented objectives are spread across several points of interest, so your first decision is whether to move toward the nearest objective or preserve a safer extraction route.
- Leave room for objective items. Scanning and downloading require you to remain at an interaction point, so avoid filling your inventory with low-value loot before the contract work is complete.
- Plan an exit before interacting. Especially in stage three, know where you will extract if the current contract requires all work in one run.
Priority Contracts no longer require a faction rank under the June update. Bungie also said the tuning was intended to reduce heavy traversal and requirements to finish objectives in one run, but the update did not provide a Data Reconstruction-specific checklist. Treat that statement as a general system change, not proof that every stage is now multi-run.
How do you complete Data Reconstruction stage one on Perimeter?
The earlier stage-one version asks for four bioprinter scans and an agriculture report: two Sparkleaf scans in South Relay, two Fungal scans in Overflow, and a report download at North Relay.
1. Scan the Sparkleaf bioprinters in South Relay
Enter South Relay and use the objective markers to locate the two Sparkleaf bioprinters. Start each scan and remain in the interaction area until the progress completes. If the current contract shows a different count or plant type, follow that panel instead of the older objective list.
2. Scan the Fungal bioprinters in Overflow
Travel to Overflow and repeat the process at two Fungal bioprinters. The stage-one guides describe these scans as separate objectives, so check that each interaction has registered before leaving the area. A missed scan is easy to overlook when several markers are close together.
3. Download the agriculture report at North Relay
The documented report terminal is inside a North Relay building. A location guide says the building’s power must be restored before the terminal can be used; that is a guide-reported interaction detail rather than a condition reconfirmed in Bungie’s October notes. If the terminal is inactive, look for the power interaction indicated by the objective marker, restore it, and then return to the report terminal.
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Earlier guides state that stage-one scans and the report can be completed across multiple deployments. If the live contract does not show a single-run condition, you can safely split the route: complete the nearest scans, extract, and resume the remaining objective later. If the panel does impose a run limit, prioritize the objective order shown there rather than relying on the older route.
How do you complete Data Reconstruction stage two on Dire Marsh?
The documented second stage moves to Dire Marsh and uses two locations: Algae Ponds and AI Uplink. You must download harvest logs and hack three data repositories.
1. Download the harvest logs at Algae Ponds
Look for the terminal on the second floor at Algae Ponds. Go upstairs, begin the download, and stay close until it completes. Because the interaction is elevated and exposed, check nearby approaches before committing to the full download animation. The second-stage walkthrough from The Profaned Geek identifies this second-floor terminal as the harvest-log location.
2. Hack three repositories on the AI Uplink catwalk
Move to the AI Uplink catwalk and locate the three data repositories. Hack each repository individually and verify the counter advances after every completion. The catwalk layout makes it possible to string the interactions together, but do not assume that one hack has counted merely because the terminal animation finished; check the contract tracker.
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The earlier version allows the Algae Ponds download and AI Uplink hacks in either order, and the guides describe progress as persistent across runs. Use that flexibility to choose the safer path from your spawn. If Algae Ponds is nearby, complete the harvest logs first; if AI Uplink is the better approach, clear the catwalk objectives and leave before crossing the map. The current contract may alter this persistence or the repository count, so confirm the panel before deploying.
How do you finish Data Reconstruction stage three on Perimeter?
The final documented stage returns to Perimeter. It combines two exterior repository hacks, an AI maintenance protocol download at Hauler, and successful extraction.
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1. Hack the exterior repositories
The earlier guide places the two repository objectives outside North Relay or South Relay. Use the live map markers to determine which relay is active in your contract; do not treat North and South Relay as two mandatory pairs if the panel lists a combined count. Hack both exterior repositories and wait for the objective tracker to update after each one.
2. Download the AI maintenance protocol at Hauler
Travel to Hauler and interact with the AI maintenance protocol terminal. The older walkthroughs identify this as a separate download after the relay repository work. Keep your route toward extraction in mind before starting the download, because an interaction that completes the objective can also make your position predictable to other players.
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An earlier stage-three guide says the repository hacks and Hauler download must be completed in one run before extraction. That same-run requirement is not established as current after the October reset: Bungie’s June update described general efforts to reduce single-run requirements, while the October reset note did not publish the revised Data Reconstruction text. Therefore, check for an explicit “complete in a single run” instruction in the active contract. If it appears, do not leave until every objective is marked complete, then extract. If it does not, the contract may permit progress across deployments, but extraction is still required to bank the run’s progress.
The stage-three location guide from Destructoid is useful for recognizing the relay repositories and Hauler protocol, while the matching walkthrough provides another route description. Both predate the October contract reset.
What is the safest route through each map?
There is no source-supported universal route that is best from every spawn. The practical rule is to group objectives by map area, then keep extraction direction in mind.
- Perimeter stage one: Use the contract’s marker order to connect South Relay, Overflow, and North Relay. If your spawn is closer to Overflow, start there rather than crossing the map immediately; if the report terminal requires power, allow time for both interactions at North Relay.
- Dire Marsh stage two: Choose Algae Ponds or AI Uplink first based on spawn and nearby threats. The earlier version permits either order, so there is no need to force a particular sequence.
- Perimeter stage three: Favor a route that ends near extraction after the Hauler download. If the current panel requires one run, avoid optional detours until the two relay hacks and protocol are complete.
Objective interactions are vulnerable moments. Clear the immediate approach, start the scan or download only when you have an exit, and check the tracker before moving on. These are general execution precautions, not a claim of a measured route time or combat performance.
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What changed after the 2026 Priority Contract reset?
Bungie’s June 2, 2026 update removed faction-rank requirements for Priority Contracts and described tuning intended to reduce long traversal and single-run objective demands. Bungie’s Season 2 announcement likewise said Priority Contracts would focus more on loot rewards than hard reputation gates. On October 6, the Nightfall Refresh reset Priority Contracts, faction levels, and zone access.
None of those official notes reproduces Data Reconstruction’s complete post-reset objective text. That creates a clear distinction:
- Documented: the earlier three-stage route, named locations, and interaction types.
- Not verified for the current contract: exact counts, power-restoration requirements, whether stages persist across runs, and whether stage three requires one complete deployment.
Use the guides for orientation, but use the in-game contract for the authoritative requirement. If the two disagree, record the live objective and follow it; the older article cannot establish a post-reset rule.
Why is an objective not counting?
Most apparent failures come from interacting with the wrong object, leaving before the progress completes, or reading an older count. Work through this checklist:
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- Reopen the contract panel. Confirm the exact noun and number: Sparkleaf versus Fungal, report versus logs, and repository count.
- Check the location marker. A nearby terminal may belong to another activity even when it looks similar.
- Finish the interaction. Do not move away when the bar is nearly complete; wait for the tracker or completion message.
- Confirm the run rule. If the contract says one run, extracting early may leave the stage incomplete even if individual objectives registered.
- Reload only after verifying persistence. If the stage does not explicitly allow multiple runs, assume unfinished work may need to be repeated.
If a guide says a terminal needs power but the live objective provides no power step, follow the live marker and text. Conversely, if the game adds a power or access requirement, treat it as current even though the older walkthrough omitted it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does Data Reconstruction still require faction reputation?
No faction-rank requirement is expected under Bungie’s June 2026 Priority Contract changes, which removed that gate. The October reset also reset faction levels and zone access, so your account may still need to re-establish access to areas or activities even when the contract itself no longer checks faction rank.
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Can you complete the contract across multiple runs?
The earlier guides describe stages one and two as multi-run objectives, while one stage-three guide describes a single-run finish. Because the October reset changed the contract set and Bungie later discussed reducing single-run demands, the current panel is the only reliable answer for your deployment.
Where is the AI maintenance protocol?
In the documented stage-three version, the AI maintenance protocol is downloaded at Hauler on Perimeter. The route and objective may have changed after the reset, so use the active marker if Hauler is not listed or if the contract gives a different interaction name.
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Follow the live contract and use this article only as a location reference for the earlier version. Counts, persistence, and extraction conditions can change without the detailed objective list appearing in a general patch summary.
Frequently Asked Questions
Does Data Reconstruction unlock a special map or faction level?
The documented material treats it as a NuCaloric Priority Contract rather than a separate map unlock. Bungie’s reset changed faction levels and zone access globally, so any access prompt you see should be checked against the current activity requirements rather than assumed to come from this contract.
Can I abandon a run after completing one objective and keep that progress?
Earlier walkthroughs say the first two stages can retain progress across runs, but that behavior is not confirmed for the post-reset contract. Check whether the contract tracker marks the objective as persistent before relying on an early extraction.
Why can’t I find the North Relay agriculture terminal?
The earlier route places the agriculture report inside a North Relay building and says power may need to be restored first. If the current marker points elsewhere or no power interaction appears, the live contract has likely changed the requirement and should take precedence.
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No. An older guide states that the repositories and Hauler protocol must be completed before extracting in the same run, but Bungie later announced general tuning to reduce single-run requirements and did not publish the revised Data Reconstruction text. Look for an explicit single-run instruction in the active contract.
