How Japan Built One of the Most Dangerous Dam in History

Deep in the Japanese Alps, Japan built a 610-foot concrete dam in a gorge that heavy machinery could barely reach. Kurobe Dam took seven years, more than 10 million workdays, and 171 lives. This documentary explores the engineering and human effort behind this extraordinary mountain megaproject. Before construction could begin, crews carved a 3.4-mile access tunnel and battled an underground flood. Engineers diverted the river, removed weak rock, and sealed the fractured foundation with cement grout. Cableways carried massive concrete buckets across the gorge, while cooling pipes prevented the growing dam from cracking. But raising the wall was only half the challenge. Weak mountainsides forced a redesign, while workers excavated an enormous underground powerhouse and installed steep steel pipelines to drive its turbines. From cliffside surveys to reservoir testing, discover how Japan built Kurobe Dam—and the sacrifices behind every stage of construction. 📌 TIMESTAMPS: 00:00 - Introduction: The Human Cost of Kurobe Dam 01:57 - Carving an Access Route Through the Japanese Alps 04:15 - Building the Dam’s Foundations 06:45 - Raising the Giant Concrete Dam 12:17 - Building an Underground Power Plant 15:24 - Bringing the Entire System to Life 💬 JOIN THE DISCUSSION: Which construction challenge impressed you most—breaking through the flooded mountain, securing the dam’s foundations, or installing an entire power plant underground? Share your thoughts in the comments below! 🔔 Subscribe for more documentaries exploring how the world’s biggest dams, tunnels, bridges, and infrastructure megaprojects are built.