An oil spill on the Mississippi river has closed traffic on the river. Over 400,000 gallons of No. 6 fuel oil spilled when a barge split in half. I've worked with No. 6 fuel oil in the past. We called it Bunker C. It is a very heavy oil the consistancy of peanut butter that is or was used in ships as thier fuel. I've cleaned several large tanks with residual oil and it's no fun. The stuff is so thick you have to spray it with diesel to got it soft enough to scrape. In spite of wearing gloves, moon suit and respirator the stuff manages to get on your skin and clothes. It doesn't smell too pretty either. Just glad I didn't do too many of those tanks.
Oh and a bit of a news flash. In spite of the best efforts by the clean up crew they'll only be able to soak up about 10% of the spill. The rest will sink to the botton and poison the bottom feeder fish and critters. That's not me that's just the facts of how things work.