Explosion and Oil Spill
At 9:45 P.M. CDT on 20 April 2010, during the final phases of drilling the exploratory well at Macondo, a geyser of seawater erupted from the marine riser onto the rig, shooting 240 ft (73 m) into the air. This was soon followed by the eruption of a slushy combination of mud, methane gas, and water. The gas component of the slushy material quickly transitioned into a fully gaseous state and then ignited into a series of explosions and then a firestorm. An attempt was made to activate the blowout preventer, but it failed.
At the time of the explosion, there were 126 crew on board; seven were employees of BP, 79 of Transocean, there were also employees of various other companies involved in the operation of the rig, including Anadarko, Halliburton and M-I SWACO. Eleven workers were presumed killed in the initial explosion. The rig was evacuated, with numerous injured workers airlifted to medical facilities. After burning for approximately 36 hours, Deepwater Horizon sank on 22 April 2010. The remains of the rig were located resting on the seafloor approximately 5,000 ft (1,500 m) deep at that location, and about 1,300 ft (400 m) (quarter of a mile) northwest of the well.
The resultant oil spill continued until 15 July when it was temporarily closed by a cap. Relief wells were used to permanently seal the well, which was declared "effectively dead" on 19 September 2010.
Read more about this topic: Deepwater Horizon
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