In this image taken from video provided by BP PLC at 4:41 p.m. CDT on Tuesday, Aug. 3, 2010, the new 75-ton cap sits atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico. In a significant step toward stopping the worst offshore oil spill in U.S. history, BP said Wednesday that mud that was forced down its blown-out well was holding back the flow of crude in the Gulf of Mexico and it was in a "static condition." (AP Photo/BP PLC)
This image taken from video provided by BP PLC at 17:56 CDT shows that oil has stopped flowing from the new 75-ton cap atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico Thursday, July 15, 2010. Engineers will monitor pressure gauges and watch for signs of leaks elsewhere in the well. (AP Photo/BP PLC)
This image taken from video provided by BP PLC at 17:56 CDT shows that oil has stopped flowing from the new 75-ton cap atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico Thursday, July 15, 2010. BP finally choked off the flow of oil into the Gulf of Mexico on Thursday -- 85 days and up to 184 million gallons after the crisis unfolded -- then began a tense 48 hours of watching to see whether the capped-off well would hold or blow a new leak. Engineers will monitor pressure gauges and watch for signs of leaks elsewhere in the well. (AP Photo/BP PLC)
This image taken from video provided by BP PLC at 14:27 CDT, shows that oil has stopped flowing from the new 75-ton cap atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico Thursday, July 15, 2010. BP vice president Kent Wells said the oil stopped flowing into the water at 14:25 CDT after engineers gradually dialed back the amount of crude escaping through the last of three vents in the cap, an 18-foot-high metal stack of pipes and valves. (AP Photo/BP PLC)
This image taken from video provided by BP PLC at 15:57 CDT, shows that oil has stopped flowing from the new 75-ton cap atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico Thursday, July 15, 2010. BP finally choked off the flow of oil into the Gulf of Mexico on Thursday -- 85 days and up to 184 million gallons after the crisis unfolded -- then began a tense 48 hours of watching to see whether the capped-off well would hold or blow a new leak. Engineers will monitor pressure gauges and watch for signs of leaks elsewhere in the well. (AP Photo/BP PLC)
This image taken from video provided by BP PLC at 15:13 CDT shows that oil has stopped flowing from the new 75-ton cap atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico Thursday, July 15, 2010. BP finally choked off the flow of oil into the Gulf of Mexico on Thursday -- 85 days and up to 184 million gallons after the crisis unfolded -- then began a tense 48 hours of watching to see whether the capped-off well would hold or blow a new leak. Engineers will monitor pressure gauges and watch for signs of leaks elsewhere in the well. (AP Photo/BP PLC)
ASSOCIATED PRESS In this image taken from video provided by BP PLC at 6:45 a.m. EDT Thursday July 15, 2010, oil flows from one of three valves of the new 75-ton cap atop the site of the Deepwater Horizon oil spill in the Gulf of Mexico as testing continues Thursday. BP engineers working to choke the flow of oil into the Gulf of Mexico found a leak on a line attached to the side of the new well cap and were trying to fix it Thursday before attempting to stop the crude.
In a photo made from video provided by BP PLC, oil emerges from the damage wellhead Wednesday morning July 14, 2010 at 1:04 a.m. EDT in the Gulf of Mexico. (AP Photo/BP PLC)
In this image taken Monday from video provided by BP PLC at 18:17 CDT, a new containment cap (left) is lowered over the broken wellhead at the site of the Deepwater Horizon oil spill in the Gulf of Mexico. Deep-sea robots swarmed around BP's ruptured oil well Monday in a delicately choreographed effort to attach the tighter-fitting cap that could finally stop crude from gushing into the Gulf of Mexico nearly three months into the crisis. (Associated Press)
