Thick, rust-colored ribbons of emulsified oil encroach on the shores of the Pass-a-Loutre Wildlife Management Area as dark pools of oil form near the Louisiana coast, 18 May 2010. Louisiana Governor's office via AP

By MATTHEW BROWN and JASON DEAREN Associated Press Writers
May 27, 2010, 11:13AM NEW ORLEANS — Marine scientists have discovered a massive new plume of what they believe to be oil deep beneath the Gulf of Mexico, stretching 22 miles from the leaking wellhead northeast toward Mobile Bay, Alabama. The discovery by researchers on the University of South Florida College of Marine Science’s Weatherbird II vessel is the second significant undersea plume recorded since the Deepwater Horizon exploded on April 20. David Hollander, associate professor of chemical oceanography at the school, says the thick plume was detected just beneath the surface down to about 3,300 feet. He says it’s more than 6 miles wide. Scientists say they are worried the undersea plumes may be from chemical dispersants used to break up the oil a mile under the surface.

New, giant sea oil plume seen in Gulf