So when his colleague, Kurt Niel, asked him to join a nearby erdstall tunnel mapping expedition last year, Edlinger readily agreed. Erdstall tunnels are mysterious underground passageways ...

The National Highways Authority of India (NHAI) has initiated trial runs for a new 5.1km tunnel connecting Dwarka Expressway ...

The Fehmarnbelt tunnel may not have grabbed the popular imagination in the same way as the Channel Tunnel between Britain and France did more than 30 years ago, but this structure is just as ...

Millions of people pass under the River Thames each day, by rail, road or foot. We take it for granted. Just two centuries ago, the idea of going under the river would have seemed fanciful. Today, ...

(CNN) — On the shores of the Baltic Sea, in the south of Denmark, a vast engineering marvel is taking shape — piece by giant concrete piece — that, when finished, will drastically redraw the ...