The inquiry found that the immediate source of the blowout was the failure of the primary well control barrier, a cemented shoe casing, and that the causes of the spill were systemic. Not one well control barrier on the H1 Well had complied with the company’s own standards; the cement casing had not been pressure-tested, despite major problems in installing it; and only one of the two required secondary well barriers was ever installed. Despite being advised of this highly dangerous situation, PTTEP ordered drilling to proceed