What is the longest and deepest tunnel in the world?

Eurotunnel (English Channel)
Lötschberg (Switzerland - Germany)
Seikan (Hokkaido-Honshu Island)
Gotthard-Basistunnel (Switzerland-Italy)
Tunnel da basa dal Son Gottard) is a railway tunnel through the Alps in Switzerland. With a route length of 57.09 km (35.5 mi),it is the world's longest and deepest traffic tunnel and the first flat, low-level route through the Alps.
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Very interesting!
reach: rather globalbuildingsgeographySwitzerland

Answers by country

Eurotunnel (English Channel)
Lötschberg (Switzerland - Germany)
Seikan (Hokkaido-Honshu Island)
Gotthard-Basistunnel (Switzerland-Italy)
answers
flagItaly
2%
0%
0%
97%
37
flagSwitzerland
3%
6%
6%
84%
32
flagAustria
0%
10%
20%
70%
10
flagthe Netherlands
18%
0%
18%
62%
16
flagGreece
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31%
18%
50%
16
flagGermany
24%
12%
19%
43%
57
flagPoland
24%
13%
22%
39%
3262
flagthe United Kingdom
24%
17%
20%
37%
97
flagthe United States
26%
13%
26%
31%
115
flagIndia
12%
37%
25%
25%
16
flagAustralia
30%
10%
40%
20%
10