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)

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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)