تونل

A tunnel is an underground or enclosed passageway excavated through earth, rock, or built structures that allows people, vehicles, or utilities to pass through obstacles like mountains, water bodies, or buildings. Tunnels matter because they enable transportation networks, utility systems, and infrastructure to connect places that would otherwise be difficult or impossible to reach, making them essential for modern roads, railways, metro systems, and essential services.

AI-generated from the Wikipedia summary — may contain errors.