The vault is almost completely dark. Fire sonar pulses to reveal its architecture, recover three resonance cores, then escape through the active rift. Every sound exposes your position to the things listening in the dark.
The next sector will be darker, louder and more heavily guarded. Select one upgrade before the rift reopens.
Resume to recapture mouse control. Your sector, collected cores and upgrades remain intact.
Your recovered fragments and records have been stored locally. Re-entering creates a fresh vault layout and removes run upgrades.
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Call the distance. Commit the bearing. Then let the vault answer.
Your best read survives the dark.