Discovery of second pipe in Deepwater Horizon riser stirs debate among experts

For the first time Friday, the Coast Guard and BP acknowledged that a mysterious second pipe, wedged next to the drill pipe in what remains of the Deepwater Horizon's riser, is fouling up the works where the well is spewing hundreds of millions of gallons of crude oil into the Gulf of Mexico. "We used a diamond saw and we got inside. We found there was actually two sets of drill pipe there," said retired Adm. Thad Allen, the top U.S. Coast Guard official overseeing the response to America's worst-ever oil spill. Some experts say a second piece of drill pipe in the riser could have prevented shear rams on the rig's blowout preventer from sealing the well and permanently cutting off the flow of oil after the April 20 explosion. The presence of two pipes could have also contributed to BP's failure to make a clean cut on the riser when securing the existing containment dome, inhibiting its ability to collect the maximum amount of oil. It "presumably fell down beside it as a result of the explosion and the riser pipe being bent over," Allen said. He noted that the second pipe does not have oil shooting from it.