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Worked example

Alternate History Generator — Windscale filters fail

@sadhvikairUpdated

Filled with

Divergence
During the October 1957 Windscale Pile 1 graphite fire, the chimney filters fail or are bypassed and the fire is not shut down as quickly. A larger pulse of iodine-131 and other fission products leaves the stack instead of being partly caught.
When
10–12 October 1957
Where
Windscale (Sellafield), Cumbria, United Kingdom; fallout over Britain and northern Europe
Style
documentary alternate history, precise, no cartoon apocalypse
End Date
today
Focus
milk ban scale, thyroid dose in children, early UK civil nuclear politics, and whether Calder Hall / later AGR programmes slow down
Constraints
This is a pile fire, not a power-reactor Chernobyl. No megaton language. Keep meteorology and 1950s British institutions intact.

The finished prompt

alternate-history-generator.windscale-filters-fail.prompt
Write a grounded alternate history. ### The change Point of divergence: During the October 1957 Windscale Pile 1 graphite fire, the chimney filters fail or are bypassed and the fire is not shut down as quickly. A larger pulse of iodine-131 and other fission products leaves the stack instead of being partly caught. When it happens: 10–12 October 1957 Where / who it hits first: Windscale (Sellafield), Cumbria, United Kingdom; fallout over Britain and northern Europe ### How to write it - Style: documentary alternate history, precise, no cartoon apocalypse - End the timeline in: today - Zoom in on: milk ban scale, thyroid dose in children, early UK civil nuclear politics, and whether Calder Hall / later AGR programmes slow down - Hard rules: This is a pile fire, not a power-reactor Chernobyl. No megaton language. Keep meteorology and 1950s British institutions intact. ### Method 1. State the real baseline in 2–4 sentences so the fork is clear. 2. Make the divergence small and mechanical — one failed action, one different decision, one piece of luck that goes the other way. Do not stack extra miracles. 3. Follow first-order effects (hours/days), then second-order (months/years), then the world as of today. 4. Keep physics, logistics, institutions, and incentives intact unless the divergence itself breaks them. No cartoon apocalypse unless the change actually implies one. 5. Mark speculation vs established fact. If numbers are uncertain, give a range and say why. 6. Say what does **not** change. Most of ordinary life continues. ### Structure 1. The day of the fork 2. The following weeks 3. Year 1 4. The next decade 5. Long tail to today 6. What still looks like our world 7. One-paragraph verdict: how this timeline differs, and how it does not Be specific about dates, quantities, and institutions. Do not turn the story into a single-theme sermon.

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