In this image taken from video provided by BP PLC, the arm of a remotely operated vehicle works at the Deepwater Horizon oil spill site in the Gulf of Mexico, Saturday, July 10, 2010. Undersea robots manipulated by engineers a mile above were expected to begin work Saturday removing the containment cap over the gushing well head in the Gulf of Mexico to replace it with a tighter-fitting cap that could funnel all the oil to tankers at the surface. If all goes according to plan, the tandem of the tighter cap and the tankers could keep all the oil from polluting the fragile Gulf as soon as Monday. But it would be only a temporary solution to the catastrophe unleashed by a drilling rig explosion. It won't plug the busted well and it remains uncertain that it will succeed. (AP Photo/BP PLC)
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