Tunnel
Bores for pedestrians and automobiles
Caldecott Garage Tunnel
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Caldecott, Tunnel

Between Oakland and Orinda

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Garage Tunnel, As A Building Structure

A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.[from wikipedia]

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