A paper "Acute Aquatic Toxicity of Three Corexit Products- an Overview," by Anita George-Ares and J. R. Clark, Exxon Biomedical Sciences, Inc., calls Corexit one of the most toxic dispersal agents ever developed.
www,iosc.org/papers/00020.pdf

Exxon Biomedical Services is a division of Exxon-Mobil devoted to safety in operations. George-Ares and Clark have authored a number of papers concerned with their research on product toxicity.


Several oil men call the Fallen Deepwater Horizon the second largest discovery ever made, covering some 25,000 sq. miles. It is also noted, in the very few tests so far, as being very high in gas content, leading to high pressure and danger of blowout.
I have not succeeded in finding a trustworthy article so the size may be questionable.