GULF OF MEXICO - The mobile offshore drilling unit holds position directly over the damaged Deepwater Horizon blowout preventer as crews work to plug the wellhead using a technique known as "top kill," May 26, 2010. The procedure is intended to stem the flow ofoil and gas and ultimately kill the well by injecting heavy drilling fluids through the blow out preventer on the seabed, down into the well. (USCG) 10Spill0526-G-8744K-003
