CROSSING THE ALPS: the largest tunnel in the world - It's Not Rocket Science

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C'est pas sorcier

Published on Dec 4, 2015
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Every year, 80 million passengers and 130 million tons of goods pass through the Alpine arc. This natural barrier, on the border of 4 countries - France, Italy, Switzerland and Austria - is one of the largest crossroads in Europe. Fred and Jamy take us to visit the Saint Gotthard construction site, a 57 km long tunnel, dug between the North and the South of Switzerland. It should be completed in 2017 and will then be the longest in the world. With the enlargement of the European Union, the traffic of goods is constantly increasing and so is pollution. To relieve congestion on the roads and railways, new railway tunnels are under construction or planned. They will allow trucks to travel on trains. Mission: Unlike the first Alpine tunnels dug into the mountain ridges, the new tunnels are built at the foot of the Alps. These construction sites are titanic. Fred descends into the bowels of the mountain, to the face, where the tunnel boring machine devours the rock and advances with a precision of about ten centimetres. There he meets the geologists and surveyors who have carried out the tunnel route and explain to us all the technical challenges they have to overcome.

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