The maritime workers performed several pressure tests to verify whether the well was sealed correctly.

The pressure test results not being interpreted correctly.

This was partially due to using liquid nitrogen to speed cure times, which, ultimately, weakened it and allowed the gas and natural gas to escape. Just like the incident in 2008, the cement was not capable of sealing the well.

The cement mixture not being able to handle the pressure.

This recognition also contributed to the crew feeling over-confident in its abilities. Several months earlier, BP and the crew on the Deepwater Horizon had broken the record for the deepest well ever capped.

Breaking the record for the deepest well completed.

Many crew members were over-confident and felt safe. Over a period of seven years prior to the explosion, the Deepwater Horizon did not have a single injury or accident onboard that was considered serious enough to shut down operations.

The prior safety track record of the Deepwater Horizon.

BP had already experienced this problem in 2008 and failed to take steps to address adjusting the cement mixture to account for the increased pressure. The cement in the capping procedure to create the core was too weak to address the pressure of the oil and natural gas.

BP not learning from its mistakes in a prior incident from 2008 in the Caspian Sea.

BP was weeks behind schedule and well over budget on the Macondo Well project and wanted to get it completed quickly. BP pushing to speed up capping the well by taking shortcuts.

Prior to the explosion on April 20, 2010, there were several incidents that, when combined, contributed to the accident and led to the explosion: On the day of the explosion, the crew was in the process of verifying that the well had been sealed so they could abandon it and move on to the next project. The day before the explosion, crew members had been pumping cement to the bottom of the borehole to seal and cap the well. Eleven people lost their lives and another seventeen were injured out of the 126 maritime crew members onboard the rig. Among the offshore accidents in recent history, the Deepwater Horizon explosion, and the subsequent oil spill, is considered to be the largest oil spill in history, as well as one of the most tragic.

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