An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating...

East West Metro Tunnel is an underwater river tunnel of Kolkata Metro in Kolkata, West Bengal. The river tunnel is constructed underneath Hooghly River...

through the access tunnel, Paul is attacked by an unknown creature, dragged underwater, and killed. Before the team leaves the access tunnel, they find that...

Mujibur Rahman Tunnel (Bengali: বঙ্গবন্ধু শেখ মুজিবুর রহমান টানেল), also known as Karnaphuli Tunnel, is an underwater expressway tunnel in the port city...

A shark tunnel (or aquarium tunnel, acrylic tunnel and exhibit tunnel) is an underwater tunnel that passes through an aquarium, typically with sharks and...

and tunnels have broken or set records. Opened in 1927, the Holland Tunnel was the world's first mechanically ventilated underwater vehicular tunnel. The...

continuous underwater tunnel for vehicular traffic in the world. The Holland Tunnel was the world's first mechanically ventilated tunnel. Its ventilation...

underwater tunnels, the two most common being bored tunnels or immersed tubes, examples are Bjørvika Tunnel and Marmaray. Submerged floating tunnels are...

century old: the original Thames Tunnel was the world's first underwater tunnel. The figure and list above leaves out a tunnel to the site of the old Ferranti...

Mesopotamia. The first underwater tunnel known certainly to have been built was the Thames Tunnel, completed in 1841. A description of the tunnel as being built...