About: http://webisa.webdatacommons.org/322439895

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	When using active sonar, a submarine transmits a pulse of sound into the water and listens for how long it takes to bounce off another object such as a ship or submarine and return.
http://www.w3.org/ns/prov#wasQuotedFrom	about.com