54K views · 504 reactions | So narrow you can barely breathe… and it keeps going Archaeologists Entered a Narrow Ancient Tunnel No One Was Meant to Use #archaeologist #archaeology #narrow #ancient #tunnel #scary | Life's Biggest Questions | Facebook

🚀Let’s go! ✅ These two images illustrate crucial stages in tunnel construction and design, from both structural and detailed engineering perspectives. The first provides a cut section view showing how waterproofing, primary lining, and secondary lining are layered to resist both soil and water pressures. Proper sealing, joint design and drainage beneath the invert are taken into account to protect long-term durability and maintain serviceability. The second image is a technical drawing that com

19K views · 295 reactions | Tunnelling is a key method in the infrastructure and construction industries. | tunnel.engineering | Facebook