Scientists Probe the Ocean Depths to Gauge Gulf Oil Spill Damage, PBS Newshour, June 30, 2010:
DR. ERNST PEEBLES, College of Marine Science, University of South Florida: [W]hat we found was layers of microscopic droplets of oil.
TOM BEARDEN: Things you can't see with the naked eye?
DR. ERNST PEEBLES: That is right. They are much smaller than you can detect with the naked eye. We had optical instruments on board that detected these droplets very readily. They had no problem at all saying that there was oil in this clear water.
TOM BEARDEN: If it is clear and you can't see it, what is the risk? What is the problem with that?
DR. ERNST PEEBLES: Toxic properties... a direct contact type of toxicity.