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)
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