It hasn't been, yet. There is a lot of oil that never came to the surface, and we are now starting to see mutations in animals with short lives because of it. A number of generations of shrimp have passed, and one mutation is shrimp without eyes.
Mutations in and of themselves are not necessarily deadly--the reason there is such is so that organisms can survive. In this case, shrimp that have been born with no eyes has an adaptability advantage over shrimp with eyes. What we don't know is what mutations we don't see have manifested.
Will that make seafood poisonous? Would it disrupt the food web? Remember that the biggest animals (like the blue whale) live on the smallest ones (krill and shrimp).
It has been known that small fish that have eaten toxic chemicals pass those toxic chemicals to the predators that eat them, and so on. Toxic chemicals do not leave our environment. Not easily.
What will the changes brought on by the BP oil explosion bring in the decades ahead? We don't know. There are birds in Minnesota which have been found to have been contaminated with the oil from the BP explosion even today.
There is still oil in the sand on the shores of Alaska from the spill of the Exxon Valdez back in 1989. This stuff doesn't go away. The oil explosion happened in the Gulf of Mexico.
Ocean currents run from the Gulf of Mexico up through the Atlantic Ocean up to Britain. It is what makes Britain habitable. Without that current, it would be very icy up there.
However, the current brings with it whatever is in it. It is possible--though I haven't heard of anyone discovering or testing for such, yet--that the exploded oil would be swept up through the Atlantic Ocean to Britain's shore. Want an example of how connected the world is?
This is one example right here. That deep sea drilling site explosion is affecting organisms around the world. It can easily be carried beyond our shores and really screw with the aquatic biota.
Will it ever get clean? I doubt we can reach far enough to do it. And since Exxon has not lived up to its responsibility, how do you suppose BP will?
The BP explosion is way bigger than the Exxon spill ever was. And is it truly capped? I doubt anybody knows.
Will it stay that way? We don't know. My personal opinion is that it won't.
Kevin Costner and his oil-eating machines do wonders, but that is with oil that is on the surface. Water does not behave like many other substances at extreme temperatures and pressures. Whereas most other substances have three matter phases, water has at least 12, probably more than that.
Because of that, other substances like oil behave differently than on the surface.
Short answer is a lot of it didn't, But some of it was gotten by machines invented by Kevin Costner.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.