This started out as an assumed lost-cause hard drive, but just as I was literally on the phone to the customer to say 'sorry your data has gone unless you want to send it to a lab' I remembered That One Time I Saw A HDD With A Dead Protection Diode and figured I'd try my luck.
TestDisk - https://www.cgsecurity.org/wiki/TestDisk
The background, by popular demand: https://www.pixiv.net/en/artworks/15043264
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