Background Story#

World overview#

Atomfall is set in the countryside of North West England in 1962. It is a fictional reworking of the real nuclear accident at Windscale in 1957: five years after the incident, the countryside around the Lake District has been sealed off wholesale as a quarantine zone, the military blocks every road in and out, the British Atomic Research and Development establishment (B.A.R.D.) moves into the underground facilities, and a superstitious cult and the drifters each take shape inside the cordon — the whole region falls into long-term fragmentation.

You play an amnesiac agent who wakes in an abandoned bunker with nothing but a clue board covered in entries. There is no conventional quest list inside the quarantine zone; you have to read documents, tapes and dialogue to piece together the secret of “Oberon” and the truth of the Windscale incident, and finally decide who to hand that secret to.

The Windscale incident: real basis and in-game reworking#

The Windscale nuclear accident is the worst nuclear accident in British history. On October 10, 1957, the No. 1 reactor at the Windscale nuclear plant in Cumbria caught fire, and the blaze burned until the early hours of the following day before it was put out. The radioactive material released by the accident spread on the smoke and dust, milk from surrounding farms was banned from sale and destroyed, and fortunately nobody died on the spot. The British government played down information about the accident at the time, and further details only came out gradually years later.

The game keeps this historical grounding but greatly amplifies the consequences: the countryside after the accident is never restored, and is instead sealed off permanently, becoming a forbidden zone cut off from the outside world.

In-game timeline#

Only two time anchors are stated officially: the Windscale incident in 1957, and the point five years later, 1962, when the game begins. The exact date the quarantine zone was created and the order in which the military and the research establishment moved in are not given as a year-by-year chronology in official material — the table below is arranged by the nodes that can be confirmed, and the remaining detail of those five years follows the in-game documents, tapes and character dialogue.

It is worth noting that the game deliberately leaves blank what happened inside the quarantine zone during those five years — the documents, tapes and radio signals scattered around only offer fragmentary records, and no single piece of material assembles a complete chronology. That narrative blank is part of the game’s structure: the truth is for the player to judge, not something the plot hands over directly.

Major factions#

There is no single power in control of the quarantine zone. The research establishment, the military, the villagers, the cult and the drifters each hold territory and pursue their own ends, and their relationships are both your source of intelligence and the fork in the road that leads to the six endings.

The Interchange and the atomic research establishment#

The Interchange is a vast underground research facility that links several regions of the quarantine zone together beneath the surface. The British Atomic Research and Development establishment posted into the zone after the accident uses it as a base, claiming publicly to be dealing with the aftermath while its actual research circles the secrets beneath Windscale and runs far more aggressively than the public line suggests. Dr. Holder is the central figure of that establishment.

The military and Captain Sims#

The military is responsible for the blockade and control of the quarantine zone, with barracks, checkpoints and barbed-wire cordons across the moorland and extremely strict checks on anyone coming or going. Captain Sims commands the garrison; he needs the clues in the agent’s hands, and he is also one of the few people who controls a way out of the quarantine zone — but his trust has to be bought with intelligence.

The Wyndham colonists#

Wyndham is one of the few villages inside the quarantine zone that still maintains everyday order. The colonists organise trade there and keep the peace, staying wary of strangers. They deliberately keep their distance from the core secret of Windscale, but because the village is where news from every direction gathers, it is also an important base for gathering clues and restocking.

Mother Jago’s cult#

Mother Jago leads a cult devoted to ancient rites deep in the forest. She sees the post-disaster quarantine zone as a promised land of rebirth, declares the power beneath Windscale a blessing, and uses that to draw in followers who lost everything in the blockade. The cult is warm and hospitable on the surface, but the true purpose of its rites is for the player to uncover.

Drifters and raiders#

Inside the cordon there are also large numbers of ordinary people of every description: some crossed the blockade line in the chaos to get into the zone, some were locals who lost their homes after the accident. They are called drifters, and most of them simply want to stay alive on this land that has slipped out of control. A portion of them slide all the way into violence and become raiders occupying abandoned outposts. Neither group has a unified leader or organisation, and encounters with them mostly end in hostility — how you handle it is up to you, and fighting is not the only option.

Key characters#

These seven parties are the skeleton of the game’s ending system: where the story ends up depends on who you choose to believe and who you hand the secret of Windscale to, once you have worked out the clues.

The core mystery: Oberon#

The surface of the Windscale incident is a nuclear accident; beneath it lies Oberon — an entity entangled with the underground facilities of the Windscale reactor. Around it, the research establishment conducts studies it refuses to discuss, the cult worships it as divine, the military guards its borders, and the rise and fall of every faction is pulled by this hidden thread. Early on it appears only as rumour, signal and fragments of conversation; as the entries on the clue board are gradually verified, its outline slowly sharpens.

The protagonist’s own origin is part of the mystery too: why this amnesiac agent turned up in the quarantine zone, who laid out the entries on the clue board, what happened around them as they woke — all of it has to be reconstructed piece by piece from documents, tapes and dialogue. The game has no mandatory main-story order, and it is entirely possible to meet one faction’s version first and then go back and overturn your own judgement — which is why this game’s narrative is so widely discussed in the community.

The six endings#

The ending is decided by your final choice: once you have uncovered the truth, whoever you hand it to determines which ending route you take. There are six endings in total, one for each of six recipients.

The six endings carry no officially defined ranking of better or worse; they read more like six exits from the same set of facts: whether you think the truth of Windscale belongs with the system, with an individual, out in the open, or in no human hands at all. The ending sequences only show what follows the handover, leaving the moral judgement to the player.

Main regions and locations#

The map of the quarantine zone is made up of several regions with very different characters, and the Interchange connects them underground. The balance of power in each region is roughly as follows:

Slatten Dale#

Where the story begins. After leaving the bunker, you first learn this game’s survival rules among this rural ruin: looting supplies, managing your pack, avoiding or killing raiders. Abandoned farmhouses, small bunkers and crash wreckage are scattered through the region, and most of the early key documents are hidden here.

Wyndham#

Home of the colonists and the closest thing to “normal life” inside the quarantine zone: there are shops, there are gatherings, there are armed locals keeping order. The village is deeply suspicious of strangers, but as long as you do not start trouble it is relatively safe. Several faction threads change hands in the village.

Casterfell Woods#

A large stretch of woodland shrouded in mist and canopy, where Mother Jago’s cult has settled. Visibility is poor and the soundscape is cluttered, so encounters tend to erupt at close range. The cult’s ritual grounds and camps are spread through it, making it the key region for understanding the cult’s beliefs.

Skethermoor#

Open moor and military ground interlock here, with checkpoints, patrols and blockade lines as the main threats. Captain Sims’ barracks sits here, and the imprisoned Dr. Garrow is here too — a region the main story cannot bypass.

The Interchange#

The hub level of the vast underground facility connects several regions of the quarantine zone, and the research establishment’s personnel, equipment and archives are concentrated here. As you explore deeper, you find that the Interchange’s real scale far exceeds what “post-disaster research” would require.

Windscale#

The reactor ruins and the core forbidden zone of the quarantine, and the endpoint of the whole story. The secret of Oberon, the truth of the accident five years ago, and the protagonist’s own origin all have to be answered inside this exclusion zone.

Environmental storytelling and atmosphere details#

The game has no long cutscenes; its world is delivered mainly through environmental detail and interactable objects. Here are a few types of design worth watching for:

These details corroborate the faction setup: the phone boxes string together the contact’s thread, broadcasts leak each side’s real intentions, and a single note left in a ruin often says more about what happened in the zone over those five years than any cutscene. Exploration is the storytelling — consistent with the game’s overall design of “little hand-holding, much verification”.

References and real-world comparison#