Gulf oil finds many paths, ScienceNews, September 7, 2010:
A team from the Woods Hole Oceanographic Institution in Woods Hole, Mass., reported in August that it had mapped a giant plume, or cloud, of oil floating beneath the surface. It is one of three or four plumes other groups have also reported.
This cloud was about as tall as a 50-story office building and more than a mile long. It was floating more than 3,000 feet beneath the surface, and the researchers say that’s mysterious. Oil usually floats on top of water, but there may be many of these plumes crawling along, deep underwater.