The National Transportation Safety Board, the agency investigating the UPS plane crash , revealed some of the data they've gotten from the "black box."

That device is made of two parts, including the cockpit voice recorder.

The NTSB said it was able to extract more than two hours of good audio, including what pilots said and background noises.

"In reviewing that audio, the crew completed their standard checklist and briefings in preparation for the flight. The takeoff roll was what we called uneventful," NTSB board member Todd Inman said.

Through the different speed callouts, he said that about 37 seconds after the crew called for takeoff thrust, a "persistent bell" was heard, and continued for 25 seconds until the end of the recording, he said.

Inman pointedly referred to it as a b

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