About: http://webisa.webdatacommons.org/430956945

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	underground excavationTITLE: tunnels and underground excavationshorizontal underground passageway produced by excavation or occasionally by nature???s action in dissolving a soluble rock, such as limestone.
http://www.w3.org/ns/prov#wasQuotedFrom	britannica.com