Inside the World’s Longest Railway Tunnel: Building Mega Structures Underground - Free Documentary

Have you ever wondered how the world’s longest and most advanced tunnels are built deep underground? 🌍

Join us on a thrilling journey beneath the earth as we explore the meticulous engineering behind high-speed rail tunnels, massive tunnel boring machines (TBMs), precision rail installations, and cutting-edge ventilation systems. Discover how thousands of tons of concrete, steel, and copper are transformed into safe and efficient underground passageways capable of withstanding extreme forces and speeds up to 330 km/h. From Switzerland’s Gotthard Base Tunnel to modern modular bridge installations, this video showcases the breathtaking innovations shaping our world.

🔧 Witness precision engineering, heavy machinery in action, and breakthrough moments that define modern infrastructure.

📌 Don’t forget to like, comment, and subscribe for more deep dives into engineering marvels!

✅ Timeline:
0:00. How Are Tunnels Built Deep Underground?
0:43. Preassembly and Transportation of High-Speed Rail Switches
2:50. Precision Installation of Switches Inside the Tunnel
4:02. Concrete Track Bed and Alignment Process
5:59. Welding and Finishing the High-Speed Railway
6:15. Precast Concrete Slab Production for Track Systems
7:15. Laying Concrete Subbases with Laser Precision
8:15. Vibration Reduction Systems and Final Rail Installation
9:34. Overhead Contact Line Installation for Power Supply
11:19. Modern Signaling and Safety Systems
12:51. Massive TBM Operation and Tunnel Segment Placement
18:10. Tunnel Floor Paving and Finishing Process
19:24. Tunnel Ventilation System Installation
20:09. TBM Cutterhead Breakthrough Moments
28:54. Dorothy TBM Completes Historic Tunnel Section

✅ Hashtags:
#TunnelConstruction #EngineeringMarvels #HighSpeedRail #TBM #UndergroundEngineering #InfrastructureInnovation #HeavyMachinery #CivilEngineering #RailwayConstruction #megaprojects
Please LIKE, your LIKE will ENCOURAGE me very much. Thank you!
SUBSCRIBE to watch more great video: https://bit.ly/3aDXZlr