Atomfall: Key Item Locations & Interactive Tracking Guide

Key Items in Atomfall are the physical keys, electronic keycards, and interactive facility consoles that unlock every locked door, sealed bunker, and restricted access point across the Windscale Quarantine Zone — the difference between a dead end and a room full of Training Stimulants, an Atomic Battery, or the Signal Redirector that opens five more doors.

All confirmed Key Item locations have been properly documented by our team across the Atomfall interactive maps.

Three Key Item Sub-Types

Physical Keys — iron and brass keys carried on bodies, found on desks, and sold by traders. Open traditional locked and barred doors. Examples: Vicar's Key (Wyndham Village), Bakery Bedroom Key, Castle Key (Casterfell Woods), Armoury Key (Skethermoor).

Electronic Keycards — Protocol and B.A.R.D. swipe cards for high-security doors, radio tower access, and bunker storerooms. Examples: Modified Keycard (Slatten Dale), Windfall Keycard, Security Keycards, Casterfell Woods Radio Tower Keycard, Crane Control Room Keycard (The Interchange).

Interactive Consoles and Machinery — the endgame layer, concentrated almost entirely in The Interchange. Battery Terminals (Alpha, Bravo, Charlie, Delta), Console A/B/C, Wing Power Controls (Alpha and Beta), Central Processor Control, Crane Controls, Self Destruct Console, Fire Safety System, Sample Extractor Console, Fire Safety Fluid Input, and four arming points (Explosives #1–4).

These aren't items carried in inventory — they're fixed points of interaction that collectively constitute the entire Interchange endgame puzzle.

The Interchange: 39 Key Items, One Complex Machine

The Interchange holds 39 Key Items — more than all four surface regions combined.

The underground facility's Key Items trace a sequential progression: Keycards open Data Store wings → Store Room Keys access loot rooms → Battery Terminals insert Atomic Batteries to power each wing → Data Store Consoles unlock the next section → Central Processor Control redirects power with the Signal Redirector → and ultimately the Self Destruct Console, Sample Extractor Console, Fire Safety System, and four Explosives arm the Oberon Dig Site for the game's various endings.

Two Trophies Tied to Key Items

"Reverse the Polarity" (Bronze, unmissable) — find the Signal Redirector. Two acquisition methods in Skethermoor:

1. The Windfall Keycard Key Item, found on Windfall's body inside the Protocol Workshop's bathroom crawlspace, opens Windfall's Crate in the Protocol Field Station;
2. A unique keycard from a bunker used to open a chest in another bunker.

"Burglar" (Bronze) — use the Signal Redirector to unlock 5 "No Power" doors (any door showing a yellow light and "No Power" interaction prompt). The Signal Redirector acts as an electronic master key for powered-down security systems throughout all five regions.

Five Critical Key Items and How to Get Them

• Modified Keycard (Slatten Dale) — given by the injured scientist at the very start of the game after crafting and giving him a Bandage. This is the key that opens every Interchange entrance blast door — the most important single Key Item in the game.

• Vicar's Key (Wyndham Village) — three acquisition methods: discover that Molly Jowett sold the Vicar an Atomic Battery and blackmail him for his key; find the "Kill the One they Call Maisie" note, inform the Vicar who killed her and deal with the killer; or kill the Vicar directly. Opens St Katherine's Church Chest (Atomic Battery + Finding inside).

• Windfall Keycard (Skethermoor) — crawl through the gap between the bathroom cabin and a cabinet in the Protocol Workshop, then squeeze through a hole to find Windfall's body. Opens Windfall's Crate (Signal Redirector + Training Stimulant) in the Protocol Field Station.

• Security Keycard (Skethermoor, ×3 locations) — faction-gated. The primary Security Keycard only becomes available if Captain Grant Sims' trust is established in Wyndham Village. Without his trust, the control room where it's found is inaccessible. Two additional Security Keycards exist in the Bunk Room and Maintenance Section of Skethermoor Prison with less restricted access.

• Casterfell Woods Radio Tower Keycard (Casterfell Woods) — in the poison gas room on the upper floor of Bunker L9. The ventilation system that clears the gas requires a Signal Redirector to activate first. Plan this one for after Skethermoor and Windfall's Crate.