A project nearing completion in the Detroit area used a custom-built, diver-operated vehicle that can operate underwater and that replaced concrete liners for two raw water tunnels, eliminating the ...

Germany and Denmark are separated by a strait of just 20 km, but getting from one country to the other by land involves a 160 ...

When the Channel Tunnel opened in 1994, the undersea rail link saw Britain grew closer to the European mainland than ever before. However, had things gone a little differently, history might have ...

A feasibility study by German tunnel experts Herrenknecht has found that drilling the tunnel is "technically viable".