The world's longest canal tunnel is the Rove Tunnel in France.
The Stad Ship Tunnel in Norway is shorter, wider, and deeper.
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The Eisenhower Tunnel is the longest vehicular tunnel.
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Depends on whether you're referring to the rail tunnel or the
road tunnel. The road tunnel is 12.87 kilometres, while the rail
tunnel is 13.7 kilometres.
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The rail tunnel or the road tunnel? Construction of the rail
tunnel began in 1857, and it was first opened in 1871.
Construction of the road tunnel spanned from 1974 to 1980.