It's a colossal project, costing over 12 billion euros, that has redrawn the map of Europe: the longest railway tunnel ever dug. Cutting through the geological millefeuille of the St. Gotthard in the Swiss Alps, this interminable tunnel will bring Switzerland and Italy closer together via a highspeed rail line, and reduce truck traffic crossing the country by transferring part of road freight transport to rail. But the construction of this gigantic tunnel was a long and arduous process. In this latest episode of Looking 4, we take you deep into the Swiss Alps to discover the countless technical challenges that had to be overcome to accomplish this engineering feat.

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#construction #megarailway #tunnel

00:00 A 12 billion euro megatunnel
00:41 The advantages of the Gotthard Base Tunnel
02:21 The historic old Gotthard tunnel
02:53 Saving time with the highspeed line
03:24 How the base tunnel works
03:56 An ultrasecure tunnel
04:27 Technical challenge 1: Finding the right route
07:07 Building the tunnels and access shafts
08:51 Tunnel boring machine attack
09:48 Challenge 2: The Sedrun section
10:47 Challenge 3: Consolidating the railway tunnel vault
11:31 Building the railway installations
13:01 The threat of the Mont Cenis base tunnel

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