The early hours: twenty minutes of warning, then the river changed colour
Survivors describe a roar before the water, phones with no signal, and the short window between the collapse upstream and the flood reaching the first villages.
Before dawn
The collapse happened upstream, out of sight of anyone living below. What reached the first settlements first was sound — described consistently by survivors as a low, mechanical roar, unlike rainfall or a landslide. Then the river went from grey to thick brown and rose over its banks in minutes.
In steep terrain, a flood wave moves faster than a phone call. Mobile networks in the worst-hit corridors failed early, either because towers were carried away or because power lines went with the first surge.
What the first hours cost
- Bridges. River crossings failed early, which immediately split rescue efforts from the communities that needed them.
- Highways. Sections of the road linking Kathmandu to the worst-hit districts were buried, turning a few hours' drive into an air-only operation.
- Work sites. Camps and tunnel works along the river were occupied overnight, which is why the missing figure climbed so steeply and stayed there.
By first light, the pattern that would define the week was already set: a confirmed death toll rising steadily, and a missing count several times larger than it.
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