Filled with
- Divergence
- During Typhoon Nina in August 1975, Banqiao and the downstream cascade still fail, but flood warnings to villages and cities below never get through. Night evacuation is thinner than even the chaotic real one.
- When
- 5–8 August 1975
- Where
- Banqiao Dam and the Ru River / Hong River basin, Henan, China
- Style
- documentary alternate history, precise, grim, logistical
- End Date
- today
- Focus
- drowning and famine in the first weeks, how the disaster is recorded inside the PRC, later Chinese dam safety, and Three Gorges debates
- Constraints
- The 1975 flood was already one of the deadliest infrastructure failures on Earth. Scale the extra harm from failed warning and extra cascade members, not from fantasy weather. Avoid Cold War sermonizing.
The finished prompt
alternate-history-generator.banqiao-warning-never-arrives.prompt
Write a grounded alternate history.
### The change
Point of divergence: During Typhoon Nina in August 1975, Banqiao and the downstream cascade still fail, but flood warnings to villages and cities below never get through. Night evacuation is thinner than even the chaotic real one.
When it happens: 5–8 August 1975
Where / who it hits first: Banqiao Dam and the Ru River / Hong River basin, Henan, China
### How to write it
- Style: documentary alternate history, precise, grim, logistical
- End the timeline in: today
- Zoom in on: drowning and famine in the first weeks, how the disaster is recorded inside the PRC, later Chinese dam safety, and Three Gorges debates
- Hard rules: The 1975 flood was already one of the deadliest infrastructure failures on Earth. Scale the extra harm from failed warning and extra cascade members, not from fantasy weather. Avoid Cold War sermonizing.
### 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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