Investigators said BP focused too much on controlling costs and speeding up operations. BP also made decisions complicating cementing operations, which the report said were the central cause of the disaster.
BP failed to communicate its decisions with Transocean, the contractor that owned the Deepwater Horizon oil rig.
“As a result, BP and Transocean personnel onboard the Deepwater Horizon … did not fully identify and evaluate the risks inherent in the operations that were being conducted at Macondo,” the report said.
The report also faulted decision making by Transocean and Halliburton in the lead-up to the explosion of the Deepwater Horizon.
Transocean misinterpreted a critical test of cement barriers surround the well, where the explosion took place. Investigators said this resulted in Transocean missing an opportunity to address the cement problems.
Halliburton was responsible for cementing the well where the explosion took place.
Click here to read the full report.