They've got some rough weather, which makes containing the slick (formed by an underwater gusher) a lot harder.
What happened was that the blowout preventer http://en.wikipedia.org/wiki/Blowout_preventer
didn't work, so there was a blowout, and then an explosion. They're trying to figure out why it didn't work; maybe they will, and maybe not, but I'd bet that they at least come up with a pretty good guess.
Josephus, that's 50x100 miles, let's say, and with over 2,400,0000 gallons of oil spewed (12+ days @ 200,000 gal/day), that's not hard to believe. Sooner or later, it'll hit the Gulf Stream and be carried to the East Coast, too.
SM: Destroyed FOREVER? LOLOLOLOLOL!