Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland - BBC News
Swiss Alps: In the Heart of the Mountain | Time
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World's longest rail tunnel to open in Switzerland under Alps | Switzerland | The Guardian
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World's longest, deepest train tunnel opens in Switzerland - The Verge
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Newly completed Swiss tunnel to transform European rail travel | News | DW | 04.09.2020
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Eurotunnel – Wikipedia
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Eurotunnel – Wikipedia
Newly completed Swiss tunnel to transform European rail travel | News | DW | 04.09.2020
Gotthard Road Tunnel - Wikipedia The Gotthard Road Tunnel in Switzerland runs from Göschenen in the canton of Uri at its north… in 2021 | Road, Tunnel, Switzerland vacation