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There are two separate Underpass Archives checklists in CONTROL Resonant: 21 Exploration entries and 15 Accounts entries, according to Camzillasmom’s 2026 walkthroughs. Most are along the story route through The Spire and the Underpass research sites during Recursions and Iterations. The final two Exploration entries require returning after the main story for Maintenance Protocol.
Use the lists below in Archives order. Several items share rooms or landmarks, so you can collect them together. The walkthroughs are third-party guides rather than an official Remedy index; their linked pages include screenshots for spots that can be difficult to identify from directions alone.
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Underpass Exploration collectibles: all 21 locations
The following names and order match Camzillasmom’s 2026 Underpass Exploration walkthrough. Items 20 and 21 are post-story collectibles in the Oldest House, not part of the main Underpass sweep.
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- Schultz Expedition Log #1 — At The Spire, a little farther up and to the left from A Half-Filled Form.
- A Half-Filled Form — In the tented research area at The Spire. Follow the ropes during Recursions and Iterations; the document is on a table near the Underpass Resonant location.
- Ayad Engineering Log #1 — On a computer desk just north of the Halfway Trail Fast Travel Door.
- Grist Research Log #1 — On the southern side of Research Site, in the room with the Player Customization box.
- Schultz Expedition Log #2 — At the western location labeled “…Research Site?”, near the garbage bags. Waste Disposal from Accounts is at the same landmark.
- Steinbeck Psychiatry Report #1 — Next to the research team Dylan finds at Research Site during Recursions and Iterations.
- Notes On Team Psychology — On the western side of Research Site. Ayad Transmission from Accounts is nearby.
- Initial Findings — On the southern side of Research Site, near the Player Customization box.
- Grist Research Log #2 — At Another Research Site, south of Research Site, in the Player Customization box room. Frequent Disagreements from Accounts is in the same room.
- Steinbeck Psychiatry Report #2 — In the southern office at Another Research Site.
- Unable To Contact Pope — In the same southern office as Steinbeck Psychiatry Report #2.
- Persistent Memory Issues — The third document in that southern office.
- Ayad Engineering Log #2 — At the western “…Research Site?” location, in the room with the Player Customization box.
- Grist Research Log #3 — Return to the western “…Research Site?” after speaking with Dr. Grist at Another Research Site. It is on the floor in the center; the walkthrough says this document is required to advance the story.
- Schultz Expedition Log #3 — In the office on the northern side of “…Research Site?”.
- Notes On Patterning/Spacetime — In the center of “…Research Site?”, where Dylan finds Schultz during Recursions and Iterations.
- Morale’s In The Toilet — In the same office as Schultz Expedition Log #3.
- Our Memories Aren’t The Problem — At “…Research Site?”, in the Player Customization box room with Ayad Engineering Log #2.
- Steinbeck Psychiatry Report #3 — At Research Site… Again, across the chasm by cable car. The walkthrough places it in the central area where researchers usually stand; Scrawled Note from Accounts is also there.
- The Roots Of The Oldest House? — During post-story Maintenance Protocol, enter the Oldest House through the door near the sapling in the Underpass. The document is in the first lobby room.
- On the Oldest House’s Form — During Maintenance Protocol, go upstairs from the first lobby room. It is in the office with the Power Upgrade box.
Underpass Accounts collectibles: all 15 locations
This separate list follows the Archives order in Camzillasmom’s 2026 Underpass Accounts walkthrough.
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- Here Be Dragons — Just after entering the Underpass from the Sinkhole.
- In Case Things Go Wrong — From the northeast entry corridor where the first item is found, drop to the platform with two rows of desks and a save point. The document is on a desk.
- The Sheer Scale Of The Underpass — During Recursions and Iterations, follow Agent Schultz’s ropes past the Underpass vendor to the next save point.
- Blazing A Trail — Continue along the rope route. Cross the shifting platforms to the larger red square platform, defeat the Hiss, shift onto the ceiling, then drop through the square floor opening. The document is on a desk on the concrete section.
- Ayad Transmission — On the western side of Research Site, near Notes On Team Psychology from Exploration.
- Strange Lights — On the level of The Spire Fast Travel door, at a small southern lookout.
- Frequent Disagreements — At Another Research Site, in the Player Customization box room with Grist Research Log #2 from Exploration.
- Everybody’s So Damn Tired — At Another Research Site, in the central area with researchers where Dylan meets Dr. Grist. The nearby southern office contains three Exploration documents.
- Note To Self — In the same section near the dead scientists as Everybody’s So Damn Tired, closer to the stairs.
- Grist Hiss Recording — Pick it up during the Recursions and Iterations objective steps called “Track the Time Fluctuations.”
- Waste Disposal — At the western “…Research Site?” location, on the floor by full garbage bags. Schultz Expedition Log #2 from Exploration is at the same landmark.
- Final Survivor — At “…Research Site?”, below the dead scientists. Several Exploration documents are also in this area.
- Scrawled Note — At Research Site… Again, across the chasm by cable car, in the office with the Character Customization box. Steinbeck Psychiatry Report #3 from Exploration is nearby.
- I Don’t Mind Dying — During “Follow the Relays to Grist,” next to the body of a dead Dylan.
- Grist’s Final Words — During “Follow the Relays to Grist,” where Dylan finds Dr. Grist after following the relays. Spoiler: the walkthrough describes it as left behind after Grist is killed.
Efficient route and items that do not count
The Underpass entrance is at the bottom of the Sinkhole in the Evacuation Zone. For a combined Archives sweep, follow the story ropes and inspect each research area, desk, office, and Player Customization box room as you travel between objectives. The paired entries called out above let you clear Exploration and Accounts together rather than revisiting the same rooms.
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- Research Site… Again: Take the cable car across the chasm; each Archives list has one entry there.
- Oldest House entries: Return after the main story for the two final Exploration documents during Maintenance Protocol.
- Map Kits: These are a separate map-reveal activity, not Archives entries. The Underpass kit guide describes one Pylon on a floating platform in the northeast and three Sensors on north, east, and south columns or platforms around it. See the Underpass Map Kit guide.
- FBC Tasks and Dylan Sketchbooks: These are separate cleanup activities, not entries in either Archives list. The cleanup guide places the Underpass FBC Task board past the cable car on the Recursions and Iterations route; it reports seven zone boards, 20 completions for Diligent Consultant, and 11 Dylan Sketchbooks across the zones.
- Astral Keys: The Underpass Resonant Astral Plane quest is also separate. Its guide directs players from the locked door to the right-hand path for the first key, straight to the far end for the second, and to the second floating platform on the left for the third. After beating The Physicist, the guide reports a choice between Spike and Astral Rebuke plus the Untapped Golden Earrings Artifact Recipe. See the Underpass Astral Keys guide.
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