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An artificial underground channel. Use specific type where known.

Related Terms

Term Note
ADIT A horizontal tunnel opening from the surface used for haulage, access to a mine, exploration or drainage.
RAILWAY TUNNEL A tunnel running under a river or a hillside through which a railway line runs.
ROAD TUNNEL A tunnel carrying a road under a river or through a hill or other obstruction.
SHAFT A vertical passage which provides access or ventilation to an underground excavation or chamber. Use only if function is unknown, otherwise use specific term. Linked Data resource