This index maps the eight chains and fifteen primary cast scenes onto the rooms, controls, objects and observations they consume, and records where those interfaces agree or conflict. It covers 8 chains (L1–L4, S1–S4), 15 primary scenes (Y1–Y3, A1–A3, D1–D3, M1–M3, I1–I3), **26 evidence index entries**, 7 mutually exclusive rescue host variants, 5 Story and Ending Map personal variants and 2 dependency orders.

**Established identities:** scene IDs Y1–I3 belong to Cast and Short Rescue Map; R01–R40 and M01–M24 to Station Room and Module Inventory; objective numbers 1–12 to Regional Discovery Map. **L1–L4 and S1–S4 are index labels here for the four numbered chains in Two Language Discovery Map and Story and Ending Map respectively.** Station Room and Module Inventory already uses L2 as shorthand for the second language chain.

**Evidence aliases:** every `A-…` key below is an index handle for observations in the cited source descriptions. The source-owner table below names those descriptions and the player decisions they inform. A handle can group the readings needed for one comparison; it is not a promise that the game captures a whole sequence in one action.

| **S2** The harmful profile | Story and Ending Map chain 2 | R13 ward machine, R19 comparison bay, R28 regulators, R40 coupling | `A-WARDLOG`, `A-WARDID`, `A-PROFILE`, `A-CARD`, `A-TREAT`, `A-REPLY`, `A-ISOLATION` (current coupling tell) |

| **D3** What crossed | Cast and Short Rescue Map; Story and Ending Map variant 4 | Ship ledger table/receiver | `A-WALLLOG`, `A-LEDGER`, `A-SEALACCOUNT`, `A-CYCLE`, `A-R18SEAL` (physical boundary context) |

|---|---|---|

| `A-BEDSIDE` | R13: the early restoration record at the patient's bed | Fact: a historical restoration occurred there | Dated | Why revival happens, or that it still works that way | Player | S1 |

| `A-PROFILE` | R19: committed active/bypass or post-isolation capture | Fact: the observed result. Interpretation: cause | Dated capture | That all revival corrupts | Player; Yeva, Dorn, Mara only if shown | Y3, M3, S2 |

| `A-SEALACCOUNT` | Dorn's account of sealing it | **Attributed testimony, not a system fact** | Dated testimony | That nobody crossed | Dorn, from being there; player only if he says so | D1, D3, S3 |

| `A-TREAT` | Recorded access benefit, hostile correction cue, purge evidence | Fact: benefit and hazard as observed | Record dated; treatment state current | That treatment is safe | Player; Ivo only if shown before the act | I3, S2, S4 |

| A-STRIP, A-CARD | Story map historical chronology; Station Room and Module Inventory R36/R19, with the same A-BERTH trace | Compare the strip, commissioning fields and docking registration to assess a limited event order; do not convert it into proof of motive. A-CARD's record may also contribute to A-WARDID |

| A-TREAT | Story map chain2/personal variant5 and the linked voluntary-treatment proposal; Cast map I3 | Accept, refuse, defer or purge after observing the benefit and hostile correction cue; show Ivo the evidence without treating consent as an unlock |

| Boundary | Required prior fact | Local action | What commits | Affected choice | Death or interruption | Current-only recheck |

| Capture a dated record | Be at the host, while the game runs | Frame and commit one still | One record with place, life and limit | Every consuming chain | Interrupted before commit yields nothing | None; a dated fact stays valid |

| Re-seat isolation | Reach R40 | Mechanical work while the game runs | Coupling state changes | S2, S4 | Completed work persists | Ward consequence needs a **direct revisit** |

| Prepare a crossing | Route walked this life; abort room stocked; retreat armed; handed-over canister at the route's full-attempt return mark | Hand over air; survivor confirms flow | Prepared | Y1, A1, D1, M1, I1 | **A shift invalidates the route check and returns the state to Waiting. It does not spend anything:** only gas actually breathed or transferred and material actually consumed are spent, and committed supplies stay at their actual locations as instances | Every element rechecked after a shift |

**Three separations.** *Holding an inference is not informing a survivor* — a player may hold a correct reading indefinitely while everyone aboard still knows nothing. This is not an extra gate: where a scene's own design is to show the evidence, the showing inside that scene is the informing, and no separate prior step is required. *A control responding is not proof of identity or history* — `A-REPLY` shows that something answers, never who. *Physical network completion is not an ending theory* — objective 12 is a walkable fact independent of objective 10, rescue, treatment and any ending; what the core contains is S4, and neither settles the other.

**Optional help.** No chain depends on it: L1–L4 are solvable with no person aboard. Yeva may name the crew roads and Dorn may describe crawl-mark use, each only when shown a record, each attributed with its basis, and neither reads an alien script or knows current topology. Help is not withheld to protect an intended deduction.

These are Regional Discovery Map's two viable orders. The arrows are **dependency priorities, not corridors**; current access can interleave eligible objectives, and either order can defer R-3 until its short geometry exists.

**Build-and-ship first — 1 → 2 → 3 → 4 → 8 → 6 → 10, then 5 → 7 → 9 → 11 → 12.** Objective 1 supplies `A-INSTALLED` at R02/R03 and `A-BERTH`; the first death makes routes historical while those facts stay current, which is S1's whole opening. Objectives 2, 3, 4 and 8 earn movement, impact and positional parts and expose the physical wall/panel/slab differences used by L2 at 1 and 8, before systematic language comparison. Seeing those differences does not automatically grant their interpretation. **Objective 6 completes without language**, from gauges and the long access, so `A-R18SEAL`, `A-CYCLE` and D1 are available before L2's shortcut is understood; 10 then exposes the apparent-departure preparation. Only afterwards do 5, 7 and 9 supply `A-RUNS`, `A-TAAN`, `A-TRANSFER`, `A-AB`, `A-ADDRESS` and `A-REPLY`, which **reinterpret evidence already stored** rather than unlocking it. Objective 11 asks for the same physical pressure-equalisation action it always asks for; the language routes make it predictable, never optional. Objective 12 depends on placement and a selected joining rule — not on 10, rescue, treatment or an ending.

**Language-and-network first — 1 → 5 → 7 → 3 → 6 → 9 → 4 → 8 → 11 → 2 → 10 → 12.** Riskier observation comes early: 5 and 7 give L1/L3 before most parts exist, and tested predictions shorten 6 and 9. Objective 4 arrives late, so R-3 and its rescue wait for a current short geometry — and **no chain stalls**, because 5, 7, 9 and 11 never require a survivor. Objective 11's iris is reached before the ship assemblies are complete; the physical action is identical. `A-STRIP` is therefore available early here and late in the other order, which changes when the three-record chronology can be assembled but not what it supports.

**What differs, and what does not.** No chain changes hands and no evidence changes meaning between the orders; what changes is *when* a record becomes available to compare and how much reinterpretation happens after the fact. Rescues and survivor help are optional in both.

**Yeva-first versus Aster-first is a compact subcase of either order.** It selects which person occupies R13 and which takes the R19 annex or R22 booth, and therefore which follow-up scene appears early. It changes no objective sequence, no evidence and no chain.

**1 — Retained evidence, changed access.** `A-WALLMARK` from R17 survives death with its place and life; the route to R17 is historical. The mark's meaning is unaffected, but whether that wall is passable **now** is current-only and needs a fresh visit.

**2 — Wrong interpretation, concrete correction.** From two `A-TRANSFER` pairs the player reads the recurring token as *source*. The corrective third pair at R23 shows the same token at a receiving end. The correction is physical and self-administered: nothing says "wrong", the earlier note keeps its original wording in revision history, and which continuation to investigate changes on the player's own reading.

**3 — Absent versus uninformed participant.** `A-PROFILE` is committed. If Dorn was never rescued, Y3 has no Dorn variant and nothing is lost invisibly. If Dorn is aboard but has not been shown the comparison, he is **present and uninformed** — a different state, and his knowledge does not update by proximity.