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(CNN) -- Scientists at the Woods Hole Oceanographic Institution said they detected a plume of hydrocarbons in June that was at least 22 miles long and more than 3,000 feet below the surface of the Gulf of Mexico, a residue of the BP Deepwater Horizon oil spill.

According to the institution, the 1.2-mile-wide, 650-foot-high plume of trapped hydrocarbons provides at least a partial answer to recent questions asking where all the oil has gone as surface slicks shrink and disappear.

"These results indicate that efforts to book-keep where the oil went must now include this plume" in the Gulf, said Christopher Reddy, a Woods Hole marine geochemist and oil spill expert. He is one of the authors of the study, which appears in the Aug. 19 issue of the journal Science.

Researchers saw the plume over two weeks in June but were chased away by Hurricane Alex, Reddy told CNN Radio.

"I have no idea where those compounds are now," he said.

But Reddy said that doesn't mean the oil from the ruptured well is gone. Experts need more data before they can determine how much remains in Gulf, he said.

Whether the plume's existence poses a significant threat to the Gulf is not yet clear, the researchers say. "We don't know how toxic it is," Reddy said in a statement, "and we don't know how it formed, or why. But knowing the size, shape, depth, and heading of this plume will be vital for answering many of these questions."

Meanwhile, Thad Allen, the government's point man for the oil disaster, responded Thursday on CNN to two recent studies that appeared to contradict the government's estimate that about 75 percent of the oil has been cleaned up.

Researchers at the University of South Florida have concluded that oil may have settled at the bottom of the Gulf farther east than previously suspected -- and at levels toxic to marine life. In addition, a team from Georgia Sea Grant and the University of Georgia released a report that estimates that 70 to 79 percent of the oil that gushed from the well "has not been recovered and remains a threat to the ecosystem," the university said in a release.

Allen said the government has determined the flow rate to have been about 53,000 barrels a day, or a total of 4.9 million barrels.

"The next question is, what happened to it?" he said. "There are certain things we know for certain. We produced almost 827,000 barrels that we collected and brought ashore." The government also knows how much oil was skimmed, how much was burned and how much was affected by dispersant use. When that is added up, it leaves 26 percent still in the water, Allen said.

"That's not a definitive statement, but that's a way to start a conversation about the oil," Allen said. "You can take a lot of different estimates and run that formula, but that's the one we're starting with ... other than the 26 percent, the rest can be accounted for some way. That 26 percent is going to end up on a beach or dealt with somehow."


We just started hearing about this. Guess this is the answer to where the oil has gone.

rosco 357

they were just talking about this on cnn, with i guess the ppl that know something about this, i think with the weather they have lost it, but said it had been moving about 6 kms in what time frame i missed, but did say it was moving either southeast or southwest, i missed that also, but i think south west, and at those depths , microbs were not eating away at it,

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