Which is the longest tunnel in the world?
Guadarrama, Spain
Iwate-Ichinohe, Japan
Seikan, Japan
Gotthard-Basistunnel, Switzerland
The world's longest and deepest rail tunnel has officially opened in Switzerland, after almost two decades of construction work. The 57km (35-mile) twin-bore Gotthard base tunnel will provide a high-speed rail link under the Swiss Alps between northern and southern Europe.
reach: rather globalarchitecturecountriesrecords
Answers by country
Guadarrama, Spain
Iwate-Ichinohe, Japan
Seikan, Japan
Gotthard-Basistunnel, Switzerland
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