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TUNNEL
An artificial underground channel. Use specific type where known.
Classifications
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. |
