ST. PETERSBURG, Fla. (AP) - University of South Florida

scientists are planning to talk about their discovery of large

underwater plumes discovered during a recent research trip to the

massive oil spill from a blown-out underwater well in the Gulf of

Mexico.

Researchers from USF's College of Marine Science said Friday

that lab tests confirmed the presence of dissolved oil in massive

deep water plumes initially discovered by sonar and other

technology aboard the research vessel Weatherbird II.

Scientists plan to discuss the plumes Tuesday, after an initial

news conference scheduled for Monday was postponed.

BP PLC denies that much oil has accumulated out of sight in the

depths.