World's Longest and Deepest Rail Tunnel, Through Swiss Alps, Opens - The New York Times
The Swiss construction project of the century – linking northern and southern Europe | House of Switzerland
15 Mind-Blowing Figures about the Gotthard Base Tunnel
Gotthard Tunnel - Wikipedia
The opening of the Gotthard Base Tunnel is approaching - GESTE Engineering SA
Gotthard Base Tunnel - Wikipedia
Gotthard Road Tunnel - Wikipedia
Gothard Base Tunel – PLURiMedia 2.0
Gotthard Base Tunnel operational ventilation - YouTube
Rail Technology for the Gotthard Base Tunnel - tunnel
File:Gotthard Base Tunnel.jpg - Wikimedia Commons
Engineers meet challenge of Gotthard tunnel - SWI swissinfo.ch
When the Wheels Start Turning, the Pulse Starts Racing - Switzerland Today Switzerland Today
Gotthard Base Tunnel (Erstfeld/Bodio, 2016) | Structurae
Gotthard Base Tunnel: The World's Longest Railway Tunnel - YouTube
Gotthard Base Tunnel, Switzerland - Railway Technology
Gotthard Base Tunnel video shows 35-mile journey underground.
/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/34/22/3422bebe-7318-4aae-a302-02c9e48c9ad8/nov2016_h09_phenom.jpg "Beneath a Mountain in Switzerland Lies the World's Longest Shortcut | Travel| Smithsonian Magazine")
Beneath a Mountain in Switzerland Lies the World's Longest Shortcut | Travel| Smithsonian Magazine
Gotthard base tunnel hi-res stock photography and images - Alamy
Gotthard Base Tunnel opens for passenger transport | Press | Company | Siemens
Gotthard tunnel: World's longest and deepest rail tunnel opens in Switzerland - BBC News
St. Gotthard Pass | Description, History, Tunnels, Roadways, & Facts | Britannica
