Difference between revisions of "Tunnel"
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Revision as of 19:56, August 31, 2014
A tunnel is a passageway through or under an obstruction, like a mountain. The world's longest tunnel is 57 kilometers (around 35 miles) through the Swiss Alps, completed after 6 decades of work in 2010,[1] although it is not open to traffic yet. The longest tunnel in operation is Japan's Seikan Tunnel.