In this Tuesday, May 11, 2010 photo released by the U.S. Coast Guard, monitors show a small pollution containment chamber, known as the 'top hat,' is lowered into the Gulf of Mexico by the motor vessel Viking Poseidon. The chamber will be used in an attempt to contain an oil leak that was caused by the mobile offshore drilling unit Deepwater Horizon explosion. (AP Photo / U.S. Coast Guard, Petty Officer 3rd Class Patrick Kelley)

(AP) Undersea robots tried to thread a small tube into the jagged pipe that is pouring oil into the Gulf of Mexico early Friday in BP’s latest attempt to cut down on the spill from a blown-out well that has pumped out more than 4 million gallons of crude. The company was trying to move the 6-inch tube into the leaking 21-inch pipe, known as the riser. The smaller tube will be surrounded by a stopper to keep oil from leaking into the sea. BP said it hopes to know by Friday evening if the tube works and can siphon the oil to a tanker at the surface.

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