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A vertical passage which provides access or ventilation to an underground excavation or chamber. Use only if function is unknown, otherwise use specific term.
|ADIT||A horizontal tunnel opening from the surface used for haulage, access to a mine, exploration or drainage.|
|COAL SHAFT||A vertical shaft providing access to the lower tunnels in a coal mine.|
|MINE SHAFT||A vertical or inclined excavation giving access to an underground mine.|
|TUNNEL||An artificial underground channel. Use specific type where known.|
|WELL||A shaft sunk into the ground to provide a supply of water.|