PORT STANLEY, FALKLANDS ISLANDS - JANUARY 23: Ocean Ultra deepwater semi submersible rig Leiv Eiriksson is starting to test the Darwin East prospect. It will be there for 45 days, estimates to find 760 million barrels on January 23, 2012 in Port Stanley, Falklands Islands. (Photo by Raphael WOLLMANN/Gamma-Rapho via Getty Images)