"Vital warning systems on the Deepwater Horizon oil rig were switched off at the time of the explosion in order to spare workers being woken by false alarms, a federal investigation has heard. The evidence of deliberate dilution of the rig's safety mechanisms is likely to have wide ramifications for BP and Transocean, the world's largest offshore drilling company. It switches the spotlight of blame away from BP and towards the subcontractor which took the decisions." http://www.guardian.co.uk/environment/2010/jul/23/deepwater-horizon-oil-rig-alarms More and more facts will come to light as time passes. Lets hope if any negligence and 'dereliction of duties' exists, those responsible will be held accountable.