Nepal's Most Beautiful Lakes Could Wipe Out Entire Valleys | Part 2

Some of the most beautiful lakes on Earth are held back by nothing but loose rock and melting ice. In Nepal, when one of those walls breaks, the valley below has hours or minutes, not days. ▶ PART 1 — The Mountain Moved:    • A Glacier Fell. 1,386 Died. What Really Ha...   Imagine waking up beside a river and finding it has stopped. Behind a wall nobody built, a lake starts to rise: one metre, two metres, ten. In Part 2 we go inside Nepal's barrier lakes: • How a retreating glacier leaves a lake behind a wall of rubble • Why that wall can rot from the inside while it still looks perfectly solid • Dig Tsho, 1985: one ice avalanche, one wave, and the valley below destroyed in hours • Tsho Rolpa and Imja Tsho: engineers working at 5,000 m to drain lakes before they fail • Jure, 2014: a mountain collapses, a river disappears, and a new lake drowns the Araniko Highway • Zhangzangbo, 1981: a lake in Tibet fails and the flood crosses into Nepal • Satellites, sirens and the race between detection and impact The 3D terrain is built from real NASA elevation data, and every flood path follows the real downhill route. 🔔 Subscribe to Nature Overturns for documentaries on the forces inside beautiful places. 💬 Would you live below a glacial lake? Tell us in the comments. CHAPTERS 00:00 A river that has stopped 00:52 When the mountain becomes a dam 00:55 The most frightening lakes don't look violent 01:19 Nepal's barrier lakes 01:42 Young, fractured, restless 02:01 How a moraine is built 02:27 A lake, from nothing 02:46 A moraine is not a dam 03:16 Inside the wall: piping 04:00 Until one day, something falls in 04:23 Displacement wave 04:36 The breach 05:01 The flood consumes the valley 05:58 Dig Tsho, 4 August 1985 07:08 Tsho Rolpa: the lake they tried to stop 08:29 Cutting an outlet into the moraine 09:07 Imja Tsho, at 5,000 metres 10:03 Lower down: when a mountain builds a dam 10:51 Jure, August 2014 11:41 A controlled release 12:10 The cascade 13:03 The questions that actually matter 13:29 Sediment: the bill that keeps arriving 14:52 What the people here already know 15:37 Satellites, radar, drones, and a digital valley 17:02 The border the water ignores 18:22 A siren is not a rescue 19:04 Between detection and impact 20:34 Beautiful, and dangerous 21:00 Look at it differently 21:38 Five lakes, five warnings 22:15 Right now 22:45 The paradox 23:40 The engine 24:12 The lake is still there #Nepal #Himalayas #glof