Uploaded September 2026 | Updated September 2026, 2 weeks ago
Was the Nepal flood man-made? That's the question filling my comments, and I'll be honest — I had it too. Was there a dam up there? A reservoir? Were the tunnels the reason? Somebody blasting on the mountain?
So I went looking. Not for you. For me.
I went back through the satellite record of that slope — a year before, seven months before, three days before, and the day it happened. And what I found is not what I expected.
The mountain was already moving.
⏱️ CHAPTERS
00:00 — The question everyone is asking
01:00 — Standing on top of Langtang Lirung
02:00 — The piece that broke
04:00 — The moment it came down
05:00 — Two lakes formed in one morning
07:00 — August 28: move to higher ground
08:00 — Before and after: a year of imagery
11:00 — Twenty months of radar data
15:00 — What this means — and what it doesn't
🏔️ WHAT I CHECKED
There is nothing built at the top of that valley. No roads, no tunnel portals, no reservoirs, no dams — on either side of the border. The failure started high on the north face of Langtang Lirung, and every piece of infrastructure in this corridor sits thousands of metres below it, down in the valley.
That answers the tunnel question. It does not answer the trigger question, and I'm not going to pretend otherwise.
📉 WHAT THE SATELLITE RECORD SHOWS
Comparing imagery from July 2025, January 2026 and three days before the collapse, you can see material building up on that slope. That's visible to anyone who looks.
What you can't see by eye is movement — and that's where radar comes in. Radar interferometry measures ground displacement at millimetre scale. Run across twenty months of scenes, it turns into a velocity: how fast a slope is creeping, and where.
The subsidence rate on that glacier roughly tripled between the 2025 and 2026 melt seasons. The last radar image was captured two days before the collapse, and the sinking was still accelerating when the record ends.
And the single fastest-moving point on the whole glacier was the point that broke.
⚠️ WHAT I'M NOT CLAIMING
This does not prove anyone predicted the collapse — nobody did. It does not prove the cause. Radar line-of-sight displacement is not the same as vertical sinking, and measuring ice and snow this way is genuinely difficult.
What it does show is that the signal existed. It was in an archive. Nobody was watching that slope.
There are thousands of slopes like it across the Himalaya and no system anywhere is monitoring them for this. That's the part that stays with me.
🙏 CREDITS
The InSAR analysis shown in the final section is the work of SpatialSense, an independent geospatial analysis firm. Satellite footage and imagery shown are credited on screen to their respective sources at the point they appear.
⚠️ Casualty and missing figures were still changing at the time of recording. Current numbers in the pinned comment.
This is my fourth video on this event. The full playlist is linked below — start at the timeline if you're new here.
I'm still researching this. When I get it wrong, I'll correct it on camera.
#NepalFlood #ManMadeDisaster #Rasuwagadhi #LangtangLirung #Trishuli #Himalaya #InSAR #SatelliteImagery #Nepal #EarthScience
Was the Nepal flood man-made? That's the question filling my comments, and I'll be honest — I had it too. Was there a dam up there? A reservoir? Were the tunnels the reason? Somebody blasting on the mountain?
So I went looking. Not for you. For me.
I went back through the satellite record of that slope — a year before, seven months before, three days before, and the day it happened. And what I found is not what I expected.
The mountain was already moving.
⏱️ CHAPTERS
00:00 — The question everyone is asking
01:00 — Standing on top of Langtang Lirung
02:00 — The piece that broke
04:00 — The moment it came down
05:00 — Two lakes formed in one morning
07:00 — August 28: move to higher ground
08:00 — Before and after: a year of imagery
11:00 — Twenty months of radar data
15:00 — What this means — and what it doesn't
🏔️ WHAT I CHECKED
There is nothing built at the top of that valley. No roads, no tunnel portals, no reservoirs, no dams — on either side of the border. The failure started high on the north face of Langtang Lirung, and every piece of infrastructure in this corridor sits thousands of metres below it, down in the valley.
That answers the tunnel question. It does not answer the trigger question, and I'm not going to pretend otherwise.
📉 WHAT THE SATELLITE RECORD SHOWS
Comparing imagery from July 2025, January 2026 and three days before the collapse, you can see material building up on that slope. That's visible to anyone who looks.
What you can't see by eye is movement — and that's where radar comes in. Radar interferometry measures ground displacement at millimetre scale. Run across twenty months of scenes, it turns into a velocity: how fast a slope is creeping, and where.
The subsidence rate on that glacier roughly tripled between the 2025 and 2026 melt seasons. The last radar image was captured two days before the collapse, and the sinking was still accelerating when the record ends.
And the single fastest-moving point on the whole glacier was the point that broke.
⚠️ WHAT I'M NOT CLAIMING
This does not prove anyone predicted the collapse — nobody did. It does not prove the cause. Radar line-of-sight displacement is not the same as vertical sinking, and measuring ice and snow this way is genuinely difficult.
What it does show is that the signal existed. It was in an archive. Nobody was watching that slope.
There are thousands of slopes like it across the Himalaya and no system anywhere is monitoring them for this. That's the part that stays with me.
🙏 CREDITS
The InSAR analysis shown in the final section is the work of SpatialSense, an independent geospatial analysis firm. Satellite footage and imagery shown are credited on screen to their respective sources at the point they appear.
⚠️ Casualty and missing figures were still changing at the time of recording. Current numbers in the pinned comment.
This is my fourth video on this event. The full playlist is linked below — start at the timeline if you're new here.
I'm still researching this. When I get it wrong, I'll correct it on camera.
#NepalFlood #ManMadeDisaster #Rasuwagadhi #LangtangLirung #Trishuli #Himalaya #InSAR #SatelliteImagery #Nepal #EarthScience
