Help to recover audio from GB file

My macbook battery (getting old) ran out of power at 20% and I was recording important audio. I had no opportunity to save beforehand.
When I powered up again on mains, the file was there and its size is 283Mb which is consistent with duration and content of recording. But when I open the file up in Garageband first I get a message saying "error in reading/writing to file com.apple.garageband.cs", then the GB window appears and the file is only 4 seconds of silence.
Is there any way I can rescue this audio in some form? If the file size is 283mb, I'm hoping the audio is on my computer somewhere. Any help or would be greatly appreciated.

control-click the project and choose "show contents". then open the Media folder. if the audio file exists, it's in there. note that a crash/power down during a write can be a very bad thing, the file could be damaged, but perhaps with a little luck it will be salvageable.

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    File size                        : 1.79 GiB
    Duration                         : 8mn 52s
    Overall bit rate                 : 28.9 Mbps
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    Format                           : DV
    Duration                         : 8mn 52s
    Bit rate mode                    : Constant
    Bit rate                         : 24.4 Mbps
    Width                            : 720 pixels
    Height                           : 480 pixels
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    Frame rate                       : 29.970 fps
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    Chroma subsampling               : 4:1:1
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    Scan type                        : Interlaced
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    Bit rate mode                    : Constant
    Bit rate                         : 1 536 Kbps
    Channel(s)                       : 2 channels
    Sampling rate                    : 48.0 KHz
    Bit depth                        : 16 bits
    Stream size                      : 0.00 Byte (0%)
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