An unknown fact about building a tunnel through a mountain! 🧐

Building a tunnel inside a mountain isn't easy. Even a small amount of loose rock can be fatal. Therefore, immediately after excavation, engineers install steel rock bolts in the walls and ceiling which firmly hold the rocks in place. Then, steel mesh is laid and high-press shortcrete is sprayed onto it. It hardens quickly, forming a strong armor around the entire tunnel, significantly reducing the risk of collapse. And the workers at this job just want a like from