Premise: Connaught Tunnel . At the time it was built , the Connaught Tunnel was the longest railway tunnel in North America . A small tunnel was built , from which cross cuts were made to the main tunnel so work could carry on at a number of headings . A tunnel is an underground passageway , dug through the surrounding soil/earth/rock and enclosed except for entrance and exit , commonly at each end .
Hypothesis: Connaught Tunnel is an underground passageway.
Label: ENTAILMENT