A 30-inch oil line under a Wisconsin river leaked groundwater at a significant rate per minute during drilling. The U.S. oil rig count remained stable despite rising oil prices. Environmental groups have challenged pipelines threatening the Great Lakes, and new drilling projects are emerging in Guyana and Uruguay. BP agreed to pay $350 million to settle remaining claims from the Deepwater Horizon incident. The FBI is investigating fires and groundwater eruptions linked to a controversial Wisconsin oil pipeline project.