Building the world’s longest tunnel tests advanced surveying technologies

Surveyors working in the Gotthard Base Tunnel, longest tunnel in the world.

Surveyors working in the Gotthard Base Tunnel, longest tunnel in the world.

The Gotthard Base Tunnel will eventually be a 35-mile rail tunnel through the famed Alps in southern Switzerland. So what does it take to survey the world’s longest tunnel? How about setting some 7,000 points over the length of the project. Check out more in this interesting article. [Source: CE News. Image: Bernd Schumacher by way of CE News]