How China Built the World's Longest Bridge Over the Open Sea

55 kilometres. One bridge. Three cities. And a tunnel hidden underneath the sea so ships could still pass over it. The Hong Kong–Zhuhai–Macau Bridge is the longest sea crossing ever built — stretching across the open South China Sea, connecting Hong Kong, Zhuhai and Macau in a single unbroken structure that took nine years and $20 billion to complete. In this video we break down exactly how they built it: → Two artificial islands built from open water in just 215 days → 33 concrete tunnel sections sunk blind to the seabed within 15 millimetres → 1,000 bridge deck sections lifted from floating cranes with 5-centimetre precision → A construction system that couldn't touch the seabed for nine straight years → The load test that proved every decision made across a decade was right This isn't just a bridge. It's the most complex sea crossing ever attempted. 🔔 Subscribe to Future Foundation for more impossible builds, mega projects and engineering stories that will change the way you see the world →    / @futurefoundations-g9d   📌 Watch this next: →    • Inside the World's Tallest Cathedral: How ...   💬 Drop a comment — which part of this build shocked you the most?