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Explore How Japan Built a $20B Wall to Avoid a Disaster Like Nepal with 6,256 views, 31 likes, and 5 comments. Experience the impact of this video content that has captured audience attention.

There is a stretch of coastline in northeast Japan where you can stand in a fishing village and not see the ocean. You can hear it. It is forty metres away. Generations of families there made their living from it. But you cannot see it, because there is twelve metres of concrete in the way. Japan built hundreds of kilometres of that wall after the 2011 Tohoku tsunami, at a cost usually reported in the region of twenty billion dollars. It went up in about a decade, and it is one of the largest coastal defence programmes any country has ever attempted. Now move four thousand kilometres west. A Himalayan valley was destroyed by something entirely different. Not an ocean wave, but a mountain. A mass of rock and ice let go at high altitude, came down, picked up half the valley on the way, and arrived at the bottom as a dense slurry closer to wet concrete than water. The people in that valley had minutes. Some had less. THIS VIDEO IS NOT ABOUT WHICH DISASTER WAS WORSE The two events have nothing in common mechanically. A seawall would have done nothing against a debris flow, and this documentary says so directly. What connects them is what happened afterwards. Japan lost around eighteen thousand people and responded by pouring concrete along its entire northeast coast. Whether that was the right decision is genuinely argued about, in Japan, by the people living behind it. Some towns refused the wall. Some fought for a lower one. Some relocated uphill instead. But they got to have that argument. They had the money to have it. Nepal has thousands of valleys with unstable rock above them. Almost none are monitored. Not because the science is missing, and not because the technology does not exist. Satellites can detect a slope creeping for months before it fails. Somebody just has to pay for the watching, every year, forever. WHAT YOU WILL LEARN Why Japan already had seawalls in 2011, and why they were not enough The two-tier defence philosophy Japan adopted afterwards, and why the second tier is an admission that the biggest events will win Why some disaster researchers think a wall can make people less safe How high Himalayan rock faces are held together by ice, and what happens as that ice retreats Why you cannot wall a Himalayan valley, even with unlimited money Why escape from a debris flow is vertical, not horizontal Why concrete gets funded and monitoring does not CHAPTERS 00:00 A Tale of Two Disasters 02:26 The Scale of the 2011 Tohoku Tsunami 04:20 Japan's Two-Tier Defense Strategy 06:09 The Community Debate & "False Sense of Security" 08:28 Himalayan Debris Flows: How Ice Holds the Mountains 10:36 Why Walls Don't Work in Nepal 11:47 The Cost of Early Warning & Monitoring Systems 13:23 The Asymmetry of Disaster Spending 14:23 Two Different Realities A NOTE Around 18,000 people died in the 2011 Tohoku earthquake and tsunami. The Nepal figures are still being revised, and every number shown on screen carries its source and date. This video contains no reconstruction footage of victims. The comparison here is about wealth and capacity, not about one country being smarter than the other. Subscribe for weekly documentaries on the engineering decisions that shape how people live and whether they survive. #Japan #Nepal #Tsunami #Engineering #Disaster #Documentary #Himalaya

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