One of the main causes was the decision - making process during the drilling operations. There were some miscalculations and underestimations of the risks involved. Also, the cement used to seal the well may not have been properly applied, which contributed to the blowout and subsequent explosion on the Deepwater Horizon.
The Deep Sea Horizon incident had multiple causes. Firstly, there were issues with the pressure management in the well. The pressure in the well was not properly controlled, which led to the blowout. Additionally, the safety protocols on the rig might not have been strictly followed. There could have been some lapses in maintenance and inspection of the equipment as well, all of which combined to cause this major disaster.
The main cause was a failure in the well's blowout preventer. This device is supposed to stop the uncontrolled release of oil and gas, but it didn't work properly in this case.