Metaphor
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The present Cascade Tunnel is 7.79 miles long. The original Cascade Tunnel was 2.63 miles long.
tunnel
Drift mines are characterized by the use of a level tunnel leading into the mine, while slope mines have an inclined tunnel, and shaft mines utilize a vertical tunnel
The Eisenhower Memorial Tunnel is 1.6 miles long...almost two miles long.
16,9 km