There is an underground passageway called Connaught Tunnel.
Connaught Tunnel . The Connaught Tunnel is a railway tunnel under the Selkirk Mountains in southeastern British Columbia , Canada , near the city of Revelstoke . The 5.022 mi tunnel carries the Canadian Pacific Railway main line under Mount Macdonald and replaced the railway 's previous routing over Rogers Pass , which had been struck by several deadly avalanches since its completion in 1885 . Trains now predominantly travel east through the Connaught Tunnel and west through the Mount Macdonald Tunnel . A tunnel is an underground passageway , dug through the surrounding soil/earth/rock and enclosed except for entrance and exit , commonly at each end .