when was the deepwater horizon oil spill capped
Deepwater Horizon oil spill 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.[61] 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.[62] 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%.[63][64][65]
Exxon Valdez oil spill The Exxon Valdez oil spill occurred in Prince William Sound, Alaska, March 24, 1989, when Exxon Valdez, an oil tanker owned by Exxon Shipping Company, bound for Long Beach, California, struck Prince William Sound's Bligh Reef at 12:04 am[1][2] local time and spilled 10.8 million US gallons (260,000 bbl; 41,000 m3) of crude oil over the next few days.[3] It is considered to be one of the most devastating human-caused environmental disasters.[4] The Valdez spill is the second largest in US waters, after the 2010 Deepwater Horizon oil spill, in terms of volume released.[5] Prince William Sound's remote location, accessible only by helicopter, plane, or boat, made government and industry response efforts difficult and severely taxed existing response plans. The region is a habitat for salmon, sea otters, seals and seabirds. The oil, originally extracted at the Prudhoe Bay oil field, eventually covered 1,300 miles (2,100 km) of coastline,[3] and 11,000 square miles (28,000 km2) of ocean.[6][7]