Gotthard Base Tunnel - Wikipedia
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Beneath a Mountain in Switzerland Lies the World's Longest Shortcut | Travel | Smithsonian Magazine
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Gotthard Base Tunnel - Wikipedia
Den Tunnelbauern geht die Arbeit noch lange nicht aus - SWI swissinfo.ch
Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland - BBC News
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Gotthard Base Tunnel in Switzerland - HOCHTIEF
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List of tunnels in Switzerland - Wikipedia
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Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland - BBC News
