A subsea survey for the fourth time has confirmed the integrity of the Macondo well and the associated relief wells in the deepwater Gulf of Mexico, BP plc said. The visual inspection by BP and Transocean Ltd., which owned the Deepwater Horizon drilling rig, was to see if residual oil remained trapped under wreckage. The sheen is not recoverable and poses no risk to the shoreline, the U.S. Coast Guard said. No conclusive evidence of hydrocarbons leaking was observed from the surveyed area, but a “white, cloudy substance” appeared to emanate from several places on the overturned rig. Samples were collected, and BP plans to review the results with federal officials.
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