About: http://webisa.webdatacommons.org/253625662

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	As stated above, although you only stayed for 20 minutes at 50 feet on the second dive, you need to add the 56 minutes of residual nitrogen you still had in your system, i.e. 56 minutes.
http://www.w3.org/ns/prov#wasQuotedFrom	scubadiverinfo.com