General alarms on Transocean Ltd.’s Deepwater Horizon drilling rig had been disabled for a year before it exploded and sank in the Gulf of Mexico, causing the biggest U.S. oil spill in history.
The alarms would’ve warned all crew members of a fire or a large amount of explosive gas and were connected to an emergency shutdown system, Mike Williams, chief electronics technician for Geneva-based Transocean, said at a U.S. Coast Guard and Interior Department joint investigation hearing today in Kenner, Louisiana.
Supervisors told him when he discovered the issue that “they didn’t want people woken up at 3 a.m. to false alarms,” Williams said.
The panel is investigating what caused the rig, which was leased to BP Plc, to explode on April 20 about 40 miles (64 kilometers) off the coast of Louisiana. The incident killed 11 workers. Today is the final day of a third round of hearings, which started in May. Another week of hearings has been scheduled in Houston next month.





