About: http://webisa.webdatacommons.org/146022132

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	Alternatively, materials or substances may be included within the internal structure of the shell 16 to enhance or enable buoyancy, such as air or cork.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk