hold the flood/station room and module inventory.md ..
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| **R23 Material Sorting Bay — M13 — O7, encounter 7, mechanism 6** | Corrective third pair, third A/B/address workstation, cross-register receiving token, Salvage Cycler source and optional Resuscitation Grid. Veilbearer screens the visible Boltspitter across separated evidence stations. | Corrects accidental reversal; removing Cycler stops sorting but preserves transfer evidence and Grid state. Different salvage responses change rigs, not translation. | **B** face. Captures, pulls and Cycler location persist; veil/Grid charge and current approach do not. Protected evidence refuses Cycler selection. |
| **R24 Transfer Service Gallery — M04 — O7** | Three sight-separated branch mouths let the player frame pair records and choose the uncertain continuation without claiming that conduits are corridors. Its closable service recess is Aster's counted abort place only when stocked and on a verified R22 short route. | Arrival elsewhere or blockage records a factual result; later arrangements can make the same room useful as a release/recovery junction. | **A** face and central release. Traversal result is provenance-bound; no branch label supplies current topology. |
| **R25 Balance Gallery — M15 — O8, encounter 8/setpiece A, mechanisms 7–8** | Bellback preview, visible Pressers, Breath Bank, Phase-Balance neutral line, fixed rib/stirrup and persistent cap/pin. One checkpoint helps free the thermal exchanger core. | With Nozzle/advanced rig the same pressure can be overpowered; low-power timing remains. Completed cap removes one draw side, changing revisit geometry. | **A/B** faces, protected control and retreat. Cap/pin/core state persists; mechanism phase and population do not. No reactive success wave. |
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| **R26 Clean-Side Decontamination — M14 — O8** | Vector Nozzle/air knife, standing-passage wall mark, open removable slab, unmarked welded duct and Mara's distinct rack/refuge. A fixed service circuit visibly runs forward A-in→B-out and reverse B-in→A-out. Purge rack or seal it, then use a quiet short crossing whose counted abort room is R27 when current geometry qualifies. | Reinterprets “marked duct” as broader candidate access and supplies Connecting's early Decontamination converter observation. Removing Nozzle makes cover/timing matter again but leaves the fixed A↔B circuit; Mara's rack has no Story30 culture consequence. | **X(A↔B)/R** faces outside clean refuge. Converter mode, slab, rack, Nozzle and rescue states persist independently; diagnostic power, pressure and route are current. |
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| **R26 Clean-Side Decontamination — M14 — O8** | Vector Nozzle/air knife, standing-passage wall mark, open removable slab, unmarked welded duct and Mara's distinct rack/refuge. A fixed service circuit visibly runs forward A-in→B-out and reverse B-in→A-out. Purge rack or seal it, then use a quiet short crossing whose counted abort room is R27 when current geometry qualifies. | Reinterprets “marked duct” as broader candidate access and supplies Connecting's early Decontamination converter observation. Removing Nozzle makes cover/timing matter again but leaves the fixed A↔B circuit; Mara's rack has no Story30 culture consequence. | **X(A↔B)/R** faces outside clean refuge. Under [Mechanical Interfaces And Opening Quantities](/Hold%20The%20Flood/Mechanical%20Interfaces%20And%20Opening%20Quantities), its mechanical selector and final detent work without diagnostic power; an actual test pulse requires current power/input. Converter mode, slab, rack, Nozzle and rescue states persist independently; pressure and route are current. |
| **R27 Thermal Exchange Room — M10 — O8/O10** | Exchanger core release and local cooling fixture show the fourth ship assembly as separate from portable Nozzle. Its pressure apron can be Mara's counted clean abort place only when stocked and on the verified R26 route. Optional A/B plate is redundancy. | Empty housing on revisit confirms installation did not duplicate the core; pump-room similarity gains a different service meaning. | **R** face, reachable release and no hidden room. Core, plate and stocked checkpoint persist under their owners. This room hosts retrieval, not the ship-side readiness report. |
| **R28 Regulator Gallery — M16 — O9, encounter 9, mechanism 9** | R1 pulled/A with scar, R2 pulled/A, R3 intact/B, R4 intact/A; panel/reply face, all four original plates, protected viewing marks, Shutterback/Caller and Capacitor. Pull R4, observe the line, then test matching R3 B plate. Nothing indispensable resides in R29/R30. | Wrong order loses the clean reply evidence but not work or Capacitor. Revisit can defer/reopen the current line with the same plate. | **A** face, fan flank and alarm lead. Pulls, lines, plate location and Capacitor persist; fan/crowd do not. Invalid plates refuse without being consumed. |
| **R29 Plate Service Stack — M20 — O9** | Optional current adjacency to R28 offers empty labelled sleeves and a wider safe staging surface for a plate already removed from its rack; it neither creates nor stores an indispensable plate by default. | Supports recovery/organisation after an invalid reply and distinguishes exact object location from “known plate.” If not adjacent, the player uses R28's own surfaces and R29 waits as a separate lead. | **B/R** faces with lower network release. Any deliberately placed plate identity/location persists; shelf labels are not translation. No duplicate appears and no control crosses rooms. |
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| **R31 Foundry Block — M10 — O12** | Familiar terminating-machine geometry emits blue-double outward at its free service face; local work demonstrates direction without declaring this a language token. | Earlier pump/cable evidence encourages inspecting which main actually ends; the result reinterprets M10 as geometry, not purpose. Current B-output adjacency to R32's distinct B-output face produces the named failed join. | **B-output** face and interior release. Direction capture persists, current adjacency does not. No extra power or death makes two outputs compatible. |
| **R32 Archive Stack — M20 — O12/story 4** | One exposed **B-output** face can oppose Foundry and refuse; a separate **R-input** face can later accept Imaging's fixed output. Layered human notes call the core patient/engine/prisoner; an A walking face can be occupied by a mistaken join. | Later cell evidence changes which note seems plausible without correcting any author. The failed B/B case and later R acceptance are two immutable faces, not a mode change. | **B-output/R-input/A** faces, each with a network-side control reachable from lower landing. Notes and joins persist; shelf order is not chronology unless physically evidenced. |
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| **R33 Imaging Exchange — M21 — O12, special connection challenge 1** | Immutable A-input and R-output faces are simultaneously inspectable; a fixed exchanger visibly maps a test pulse A→R. It has no reverse or selectable mode. | Old captures distinguish this fixed transform from R34's reversible mode and from merely carrying two static families. A wrong occupied face can be released, but a physical join alone does not prove signal flow. | **A-input/R-output** plus walking release faces. Join state persists; fixed behavior still requires current diagnostic power and compatible oriented inputs. |
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| **R33 Imaging Exchange — M21 — O12, special connection challenge 1** | Immutable A-input and R-output faces are simultaneously inspectable; the fixed exchanger is **A→R**, with no reverse or selectable mode, as linked in [Mechanical Interfaces And Opening Quantities](/Hold%20The%20Flood/Mechanical%20Interfaces%20And%20Opening%20Quantities). | Old captures distinguish this fixed transform from R34's reversible mode and from merely carrying two static families. A wrong occupied face can be released, but a physical join alone does not prove signal flow. | **A-input/R-output** plus walking release faces. Join state persists; an actual diagnostic pulse still requires current power and compatible oriented inputs. |
| **R34 Synchronization Gallery — M24 — O12, mechanism 12, special challenge 2** | Local pulse test shows one reversible A↔B transformation and current direction. Persistent roster lists joined, discovered-unjoined and anonymous counts without names. | Supplies the late converter insight and lets the player diagnose a failed family prediction. Mode change alters signal reach, never walking joins. | **X(A↔B)/R** faces, all releases inside. Mode and joins persist separately; diagnostic power is transient. Roster never reveals a room or completes a latch. |
| **R35 Receiver Vault Approach — M07 — O11, encounter 10/setpiece B entry** | Two pillars, Siphon radius, Shutterback shelter angle, Caller and finite answering entrance are visible before commit. Choose selector lane, fan flank or clamp route. | Earlier O6/O9 lessons turn the same threats into a combined work decision; cutting alarm creates a known quiet window. | **B** face and visible retreat. Cut lead persists; crowd/fan/tether state follows encounter rules. The long approach is not rescue geometry. |
| **R36 Pressure-Receiver Vault — M22 — O11, encounter 10/setpiece B, mechanism 10** | Empty vessel, gauges, builder selectors, visitor `OSH·b`, local inlet B plate/reply face, central iris and trapped builder-style seal strip under a later human adapter. Fixed internal passages lead to R37/R38 and, after iris opening, R39/R40. | Languages make pump/inward predictable; gauges/two clamps remain physical alternative. Equalisation closes the inlet line, then hand-cycle opens passage. Strip/card/berth comparison supports only limited chronology. | **A/R** external faces on the compact assembly. Clamp/equality/iris/plate/strip states persist. Closed iris cannot hide approach-side reverse or releases; R36–R40 do not shift apart. |
