Tunnels

Tunnels are underground or underwater passages built through natural or artificial obstacles, allowing vehicles, trains, pedestrians, or utilities to pass through. They are often constructed in areas where surface routes are impractical or impossible, such as urban centers, mountains, or beneath bodies of water. Tunnels are created using excavation and reinforcement methods to ensure stability and safety. They facilitate transportation, infrastructure development, and access to remote or otherwise hard-to-reach locations, helping reduce travel time and congestion while improving connectivity across regions.