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.
ShadowMaster
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Very interesting!
reach: rather globalarchitecturecountriesrecords

Answers by country

Guadarrama, Spain
Iwate-Ichinohe, Japan
Seikan, Japan
Gotthard-Basistunnel, Switzerland
answers
flagAustralia
4%
4%
12%
79%
24
flagSpain
0%
8%
16%
75%
12
flagRepublic of Ireland
0%
9%
27%
63%
11
flagPoland
3%
15%
17%
62%
2489
flagthe United States
4%
13%
20%
60%
115
flagGreece
6%
13%
13%
60%
15
flagGermany
2%
23%
15%
58%
46
flagthe United Kingdom
9%
22%
12%
54%
81
flagPakistan
13%
13%
26%
46%
15
flagCanada
13%
18%
22%
43%
53
flagIndia
9%
24%
30%
31%
66
flagthe Philippines
23%
46%
23%
7%
13