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A '''tunnel''' is a passageway through or under an obstruction, like a mountain.
A '''tunnel''' is a passageway through or under an obstruction, like a mountain.
The [[Gotthard Base Tunnel]] is the world's longest tunnel with 57 kilometers (around 35 miles) through the [[Swiss Alps]], completed after 6 decades of work in 2010,<ref>[http://www.washingtontimes.com/news/2010/oct/15/joyous-swiss-celebrate-longest-tunnel-breakthrough/ Joyous Swiss celebrate longest tunnel]</ref> and opened on the first of June 2016, and in full service on 11 December 2016.<ref>http://www.bbc.com/news/world-europe-36423250</ref>
The [[Gotthard Base Tunnel]] is the world's longest tunnel with 57 kilometers (around 35 miles) through the [[Swiss Alps]], completed after 6 decades of work in 2010,<ref>[https://www.washingtontimes.com/news/2010/oct/15/joyous-swiss-celebrate-longest-tunnel-breakthrough/ Joyous Swiss celebrate longest tunnel]</ref> and opened on the first of June 2016, and in full service on 11 December 2016.<ref>http://www.bbc.com/news/world-europe-36423250</ref>
Until then the longest tunnel in operation was Japan's Seikan Tunnel.
Until then the longest tunnel in operation was Japan's Seikan Tunnel.