BP PLC's blown-out well in the Gulf of Mexico is officially dead, five months after an explosion destroyed the Deepwater Horizon drilling rig, killed 11 workers and sparked the nation's worst offshore oil spill.

Early yesterday morning, crews completed a final pressure test on cement that had been pumped through a relief well to the bottom of the failed well, retired Coast Guard Adm. Thad Allen said.

Both the federal government and BP are rushing to take credit for the success and have promised to continue helping the Gulf Coast recover from environmental and economic damages caused by the spill.

President Obama commended his advisers and the federal science and engineering teams who contributed to the process, and he promised his administration would continue to help the Gulf Coast recover.

"This road will not be easy, but we will continue to work closely with the people of the Gulf to rebuild their livelihoods and restore the environment that supports them," Obama said in a statement.

Meanwhile, BP says it will continue sharing information it learned throughout the disaster to prevent a tragedy like this from happening again.

"Today's completion of relief well operations on the Macondo well is a significant technological accomplishment and another important milestone in our continued efforts to restore the Gulf Coast," said BP America Chairman and President Lamar McKay in a statement.

BP will now complete a series of procedures to abandon the failed well and the two relief wells. The abandonment process involves removing parts of the pipe-like casing and setting cement plugs. The Department of Interior and the Bureau of Ocean Energy Management, Regulation and Enforcement will oversee the process.