| **The layers** | Below Hearth's roof, inhabited dry halls divided by flooded cisterns, service rings and drainage shafts where the Flood gathers and migrates. Every layer has safe human interiors and dangerous wet edges. | Brief |
| **Bell House** | A half-submerged building across the nearest square, holding the failing heat cell. The **first goal** is to bring that cell home before the next cold night — *"the human reason for the trip, not a hidden countdown or campaign-ending failure clock."* | Brief |
| **Heat cell** | **Project cargo, not equipment or generic salvage**: two orthogonally adjacent rack cells of sealed, nonconductive cargo that cannot link or accept charge. | [Equipment](/Hold%20The%20Flood/Equipment) |
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| **Echo Relay** | A proposed **earned, one-cell electrical module** found in the upper sanctuary before the first credits. | [Equipment / Echo Relay](/Hold%20The%20Flood/Equipment/Echo%20Relay) |
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| **Choir Cascade** | The earned spectacular build. It clears the ordinary Flood from the central furnace hall long enough to restart it; Hearth becomes permanently warm and the first credits roll. An *apparent* ending — the community has truly achieved safety. | [Brief](/Hold%20The%20Flood/Brief#earned-spectacular-build-the-choir-cascade) |
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| **Echo Relay** *(retired)* | A former one-cell permission token for the Choir Cascade. The active direction puts multiplication in the tuned environment; the linked page preserves the superseded item in history. | [Equipment / Echo Relay](/Hold%20The%20Flood/Equipment/Echo%20Relay) |
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| **Choir Cascade** | The earned spectacular build: a five-cell Coil-and-Arc rack fired through the central furnace hall's finite tuned wet network clears every stunned ordinary body inside it once. It restarts the furnace and brings the apparent ending. | [Brief](/Hold%20The%20Flood/Brief#earned-spectacular-build--the-choir-cascade) |
| **Mara, Senn, Tavi** | The cast at Hearth. [World and Mystery](/Hold%20The%20Flood/World%20And%20Mystery) owns the clue logic and shares the cast's reasons; **that page owns the list and this row does not track it.** | World and Mystery |
| **The districts** | Named places — the Head-works, the Collector, the Exchange, the Lock Flight, the Tram Incline and any added since. Each has a page under [Districts](/Hold%20The%20Flood/Districts), **which owns the list.** | Districts |
