What is the deepest tunnel in the world?
by 
wickedwillie
ANSWERS: 3
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the Seikan Tunnel in Japan, the world's deepest underwater tunnel, is also the longest railroad tunnel at 33.5 mi (53.6 km)
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In my backyard where the dog tried to dig out under the fence...
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The Seikan Tunnel is not any longer world deepest tunnel. The deepest tunnel to date is Eiksund tunnel and its depth is 287 m (942 ft) below sea level.
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