At this week's hearings, Transocean officials recited a litany of mechanical problems that plagued the rig, which was 43 days behind schedule in drilling the Macondo well, which rig workers referred to as the "well from hell."

Williams, who has filed a lawsuit against Transocean, said a computer system that monitored well drilling operations, known as the "A chair," was often offline due to technical issues.

"We called it the blue screen of death," Williams said. "It would turn blue and you would have no data coming through.

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