Japan Built an Airport on the Sea and Why It’s Sinking?

How engineers built the Kansai International Airport on an artificial island that is slowly sinking into the ocean floor. Kansai International Airport was constructed on a massive artificial island in Osaka Bay, a project that required unprecedented engineering feats. To support the weight of the runways and terminals, crews had to navigate complex geological layers, using sand drains to accelerate the compression of soft marine clay deep beneath the ocean. This documentary covers the ongoing challenges of building on such a foundation, where land reclamation is only the beginning. As the island settles—dropping over 17 meters in some areas—the focus shifts to long-term monitoring and maintaining coastal protection. It is a masterclass in civil engineering that highlights the realities of managing major infrastructure on unstable ground. Subscribe to @TheGlobalBuild for clean 3D engineering breakdowns of the world's most complex infrastructure projects! 🏗️✈️ We break down: • Why Kansai Airport was built offshore • How the artificial island was created • What soft marine clay does under enormous weight • How sand drains help accelerate early settlement • Why deeper soil layers continue to compress • How engineers monitor settlement and maintain coastal protection • What this project reveals about building major infrastructure on challenging ground ⚠️ DISCLAIMER Content on this channel is created using AI technology for educational and documentary purposes only. It is intended for informational use and may not fully represent real-world processes or professional guidance. 0:00 The Engineering Marvel in Osaka Bay 1:07 Preparing the Seabed for Massive Weight 2:36 Accelerating Settlement with Sand Drains 4:40 Managing Long-Term Subsidence