<P> Concerns were raised about the appearance of underwater , horizontally extended plumes of dissolved oil . Researchers concluded that deep plumes of dissolved oil and gas would likely remain confined to the northern Gulf of Mexico and that the peak impact on dissolved oxygen would be delayed and long lasting . Two weeks after the wellhead was capped on 15 July 2010 , the surface oil appeared to have dissipated , while an unknown amount of subsurface oil remained . Estimates of the residual ranged from a 2010 NOAA report that claimed about half of the oil remained below the surface to independent estimates of up to 75 % . </P>
<P> Concerns were raised about the appearance of underwater , horizontally extended plumes of dissolved oil . Researchers concluded that deep plumes of dissolved oil and gas would likely remain confined to the northern Gulf of Mexico and that the peak impact on dissolved oxygen would be delayed and long lasting . Two weeks after the wellhead was capped on 15 July 2010 , the surface oil appeared to have dissipated , while an unknown amount of subsurface oil remained . Estimates of the residual ranged from a 2010 NOAA report that claimed about half of the oil remained below the surface to independent estimates of up to 75 % . </P>
when was the deepwater horizon oil spill capped
when was the deepwater horizon oil spill capped
15 July 2010
15 July 2010