tonnels
Tonnels is the French plural form of tonnel, a term used in French for tunnel. In English, the corresponding word is tunnel. Tunnels are passages that run underground or underwater and are constructed to enable transportation, drainage, utilities, or mining, often spanning long distances where surface routes are impractical.
Common types include road tunnels (for vehicles), rail tunnels (for trains), water and utility tunnels (carrying
Construction methods include cut-and-cover for shallow tunnels, bored tunnels using tunnel boring machines for longer routes,
Notable examples include the Channel Tunnel, which connects Great Britain and France, and the Gotthard Base