The paper, with representatives Henry Waxman and Bart Stupak, who was briefed by BP on the development of its internal investigation, also said problems were found in equipment designed to provide reliable protection against a blow out.
A BP investigator gave lawmakers that the fundamental errors may have been made because a lot of pressure on the drill line at 1,400 pounds per square inch (98 kg per cm), was an "indicator of a very great deformity."