When the Deepwater Horizon oil rig exploded on April 20, killing 11 workers and leading to the biggest oil spill in U.S. history, it had a backlog of thousands of hours of overdue maintenance, a lawyer for BP said at a federal hearing Monday. The rig had experienced many operational problems, including partial blackouts and freezing computers, the Los Angeles Times reports.
According to BP lawyer Richard Godfrey, a 2009 audit showed that the rig had “overdue planned maintenance considered excessive — 390 jobs amounting to 3,545 man hours.”
BP was leasing the rig from Transocean Ltd.
Deepwater Horizon’s chief engineer, Stephen Bertone, a Transocean employee, could not say how many of the maintenance jobs listed as backlogged on the audit had actually been successfully completed.
The Times reports that, under questioning, Bertone said that a hard drive was replaced on a computer system monitoring the rig that had a history of freezing up. But Bertone said he didn’t know whether there were problems after the hard drive was replaced.
In his testimony, Bertone also said that the rig’s thruster — an underwater propeller — had been having problems for eight months before the explosion.
According to Bertone, the oil rig was supposed to undergo an overhaul in 2011, including repair work on the thrusters, engines and drilling systems.
Today, a lawyer for another Transocean employee, chief electronics technician Mike Williams, suggested that some of the rig’s safety functions were put on bypass mode and not operating when the accident occurred, The New Orleans Times-Picayune reports.
Bertone said that he did not remember hearing the general alarm go off when the explosions began.
In other testimony at the hearing, it was disclosed that an eyewitness reported seeing Deepwater Horizon’s captain order a crew member to leave an injured member behind when the workers evacuated.


