Editing Ocean Drilling Program (section)

==== Circulation Obviation Retrofit Kit (CORK) ====
A specific technological advance that was implemented in the ODP was the CORK, which was used in 18 holes during ODP beginning in 1989.<ref name=":3">{{Cite book |url=http://publications.iodp.org/proceedings/301/301toc.htm |title=Proceedings of the IODP, 301 |chapter=A review of CORK designs and operations during the Ocean Drilling Program |date=2005-10-31 |publisher=Integrated Ocean Drilling Program |editor-last=Fisher |editor-first=A.T. |volume=301 |language=en |doi=10.2204/iodp.proc.301.104.2005 |editor-last2=Urabe |editor-first2=T. |editor-last3=Klaus |editor-first3=A. |editor-last4=and the Expedition 301 Scientists}}</ref> CORKs are a long-term [[Hydrogeology|hydrogeological]] monitoring system that sealed drilled holes and allowed for further observation.<ref name=":3" /> A CORK consisted of two parts: the body that sealed the system into the hole and the data log and sensor system.<ref name=":3" /> If drilled [[Borehole|boreholes]] were left unsealed, the subsurface environment was disturbed and not able to be monitored in the future.<ref name=":3" /> Using CORKs to seal holes allowed environmental equilibrium to be reestablished, and observations provided understanding into hydrogeological processes in the subsurface.<ref name=":3" />