You know, this makes sense. Bubbles of oil have risen from the ocean bottom before, (no I cannot find a reference, I am disappointed by this, but if humans can

You know, this makes sense. Bubbles of oil have risen from the ocean bottom before, (no I cannot find a reference, I am disappointed by this, but if humans can cause it then nature can do worse more often) and we have not found any big dead spots in the ocean floor. It makes since either it happens incredibly rarely or the ocean's ecosystem had a natural defense to the problem.