Scientists: Underwater plume of oil headed out to sea - USATODAY.com: "The plume is compact, much thicker than the lighter remnants reaching the surface and suspended in about 3,000 feet of ocean, he said. A deepwater current is dragging it out to sea. The underwater oil cloud is not connected to the surface slick — now the size of Delaware and Rhode Island combined.
'This [underwater] plume is some of the heavier products of the oil that won't reach the surface,' Asper said in a radio-telephone interview from aboard the R/V Pelican, a 116-foot research ship at the site of the spill. 'We think this oil is going to stay down there. It doesn't look like it's coming to the surface.'"