Tunnel

A tunnel is a passage built underground or through a mountain, designed for transportation or utilities. It allows vehicles, trains, or pedestrians to travel through areas that would otherwise be difficult or impossible to cross, such as mountains or under rivers. Tunnels are created by excavating or boring through earth or rock, often using specialized machinery. They are essential for efficient infrastructure, reducing travel time and connecting regions. Modern tunnel construction emphasizes safety, engineering precision, and environmental considerations, making tunnels vital for urban development and transportation networks.