NASA testing Apollo 11 rocket engine

In this July 16, 1969 file photo provided by NASA, the Saturn V rocket that launched Neil Armstrong, Buzz Aldrin and Michael Collins on their Apollo 11 moon mission lifts off at Cape Kennedy, Fla. For more than four decades, the powerful engines that helped boost the Apollo 11 mission to the moon have rested in the Atlantic. Now Internet billionaire and space enthusiast Jeff Bezos, CEO of Amazon.com, wants to raise at least one of them to the surface. (AP Photo/NASA, File)
In this July 16, 1969 file photo provided by NASA, the Saturn V rocket that launched Neil Armstrong, Buzz Aldrin and Michael Collins on their Apollo 11 moon mission lifts off at Cape Kennedy, Fla. For more than four decades, the powerful engines that helped boost the Apollo 11 mission to the moon have rested in the Atlantic. Now Internet billionaire and space enthusiast Jeff Bezos, CEO of Amazon.com, wants to raise at least one of them to the surface. (AP Photo/NASA, File)

Engineers hope to gain valuable knowledge from the engine, which was originally supposed to power the Apollo 11 moon mission in 1969 but was grounded by a problem.