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BP Relief Wells Bring Risk of Bigger Gulf of Mexico Oil Spill

BP Plc faces the risk of an even bigger oil spill as it attempts to drill two so-called relief wells to plug a leak on the seabed of the Gulf of Mexico that’s gushing 5,000 barrels a day into the ocean.

The relief wells will pump cement into the leak to seal it. To do that, BP will need to first drill into the same deposit of oil and gas that caused a pressure surge known as a blowout at the original well, igniting an explosion that killed 11 workers and sank a $365 million drilling rig.