Underwater plumes found at different depths

Not all oil is lighter than water. Some of it is denser. That means it will rise to a certain level of density in the water column (up or down) and then stop, or, get trapped the way clouds do in the sky on an inversion layer.

This was coming, no one in the media mentioned it. Paid scientists failed to consider it, but, there you go. Kinda like the health expert working for a tobacco company.

The result is, this oil spill is much bigger than anticipated, much bigger than the stain on the surface of the gulf.