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Survey Bunker
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A hatch-and-ladder shelter left by the Halcyon Survey: a ladder shaft down to a hub chamber, a few corridors and rooms, one sealed vault and the Survey's logs. On Earth it is where the story starts.
- Earth (overworld): dry land — plains, meadows, deserts, forests, taigas, savannas, badlands and snowy plains. Rare: in testing the nearest bunker was usually 1.1–1.2 km away; over ocean it can be much farther.
- Every moon and planet (with Nerospace): more common than on Earth.
- Sites must be dry and reasonably flat. The hub sits deep enough that rooms stay buried on a slope.
- A hatch on the surface and a ladder down into the hub. One hub layout of three is chosen per bunker.
- Corridors (straight, long, turns, a junction) leading to rooms: store, lab, service, canteen and archive. The archive room has a Log Terminal.
- Satellites near some bunkers: a fallen or standing antenna, and a supply cache.
- Chests with salvage, supplies and Earth data shards.
The hub holds a Vault Cache sealed by three or four Ballast Plates. Each plate shows how many items it needs; load every plate exactly to unseal the vault. See Puzzles.
A Ruin Spawner is set into the hub floor; its range covers the ladder foot, every plate and the vault, so you cannot reach the vault without waking it. Arc Grates lie in some corridors. See Guardians.
The bunker has no separate gated room, so its hull is mineable. The vault, plates and spawner are unbreakable, and the vault stays sealed until its plates are solved.