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A train drives past the northern gates of the NEAT Gotthard Base Tunnel near the town of Erstfeld, Switzerland March 31, 2016. The 57.1-km (35.5 mile)-long Gotthard Base Tunnel, 17 years under construction and designed to last a century, is part of a 23 billion Swiss franc infrastructure project to speed passengers and cargo by rail under the mountain chain that divides Europe's north and south. Around 260 freight trains and 65 passenger trains will traverse the two-tube tunnel daily once final testing ends later this year. Engineers had to dig and blast through 73 kinds of rock as hard as granite and as soft as sugar. Nine workers died. (Photo by Arnd Wiegmann/Reuters)
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