FILE - This file photo provided by the U.S. Coast Guard shows oil leaking from the drill pipe of the Deepwater Horizon drilling rig after it sank on April 22, 2010, two days after it ex

 

              FILE - This file photo provided by the U.S. Coast Guard shows oil leaking from the drill pipe of the Deepwater Horizon drilling rig after it sank on April 22, 2010, two days after it ex
FILE - This file photo provided by the U.S. Coast Guard shows oil leaking from the drill pipe of the Deepwater Horizon drilling rig after it sank on April 22, 2010, two days after it exploded. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP photo/US Coast Guard, File)