Inside the World's Most Complex Underwater Construction

How do underwater tunnels connect without flooding? The surprising part: sea pressure helps tighten the seal. This animated explanation follows the immersed tube tunnel method: sealed sections are lowered onto a prepared foundation, aligned, and joined underwater. See how draining the small pocket between the end walls lets the pressure difference compress the rubber gasket, helping keep the tunnel dry. 0:00 How can tunnels connect underwater? 0:13 Sealed ends keep the tunnel dry 0:25 Buoyancy, ballast and the foundation 0:42 Aligning and joining the sections 1:03 Draining the pocket and using water pressure 1:21 Compressing and testing the seals 1:45 Opening the connected passage Subscribe to RanKong for visual explanations of engineering that looks impossible. Original illustrative 3D animation with synthetic narration. Cutaways, movements and seal profiles are simplified for clarity. The test indicator is illustrative, not a measured result. #UnderwaterTunnel #Engineering #HowItWorks