Introduction - tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by natures action in dissolving a soluble rock, such as limestone. A vertical opening is usually called a shaft. Tunnels have many uses: for mining ores, for transportationincluding road vehicles, trains, subways, and canalsand for conducting water and sewage.
Underground chambers, often associated with a complex of connecting tunnels and shafts, increasingly are being used for such things as underground hydroelectric-power plants, ore-processing plants, pumping stations, vehicle parking, storage of oil and water, water-treatment plants, warehouses, and light manufacturing; also command centres and other special military needs.
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