The Macondo well is a joint venture of BP (65% ownership), Anadarko (25%) and Moex Offshore (part of Mitsui Oil Exploration, which is majority-owned by Mitsui & Co.) (10%). BP is the joint venture operator. The Deepwater Horizon rig was owned by Transocean and leased to BP. Nine of the workers killed in the explosion and fire were Transocean employees while two worked for drilling services contractor M-I Swaco (joint venture Smith Intl. & Schlumberger). In a report on the causes of the disaster released on 8 September 2010, BP made eight “key findings related to the causes of the accident,” including findings regarding -a cement barrier pumped into the well the day before by Halliburton;-a test regarding “well integrity” – BP says that “The Transocean rig crew and BP well site leaders reached the incorrect view that the test was successful"... [includes links to additional statements by companies including BP, Halliburton, Transocean regarding their roles in the Deepwater Horizon/Macondo disaster]