Deepwater Horizon and the Gulf oil spill – the key questions answered

Guardian: Why was there an explosion and fire on Deepwater Horizon oil rig? According to BP's September 2010 report, the accident started with a "well integrity failure". This was followed by a loss of control of the pressure of the fluid in the well. The "blowout preventer", a device which should automatically seal the well in the event of such a loss of control, failed to engage. Hydrocarbons shot up the well at an uncontrollable rate and ignited, causing a series of explosions on the rig. How many......

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