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FILE- In this April 21, 2010 file image provided by the U.S. Coast Guard, fire boat response crews battle the blazing remnants of the off shore oil rig Deepwater Horizon. The Obama administration put a temporary stop to new federal contracts with British oil company BP on Wednesday, citing the company's "lack of business integrity" and criminal proceedings stemming from the Deepwater Horizon disaster in 2010. (AP Photo/US Coast Guard, File)
The Coast Guard said Tuesday that the recent inspections confirmed BP's Macondo well, which blew out in April 2010 and spawned the nation's worst offshore oil spill, remains secure and isn't leaking any oil.
However, investigators collected samples of a white, cloudy substance that appeared to be coming from several areas on the overturned rig on the sea floor. The substance is not believed to be oil.
Remote-operated vehicles were used to inspect the rig, a riser that once connected the rig to the sea floor and a steel container lowered over a leaking drill pipe after the spill.