underpass, subway - an underground tunnel or passage enabling pedestrians to cross a road or railway.
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Chesapeake Bay Bridge Tunnel - Underwater - Virginia Beach - Virginia - 4K Infrastructure Drive - YouTube. Sunset drive on the famous Chesapeake Bay Bridge Tunnel with carries US 13 from the Hampton Roads Area of Virginia to the Eastern Shore of the state.
It is noteworthy that the word tunnel itself moved from France to England and then back again. The Oxford English Dictionary gives as its first definition of tunnel, from the 15th Century, a net for catching partridges. It is true that it was used to mean the sort of tube-shaped net into which birds can be coaxed.