Ubuntu :: Fsck Image Made Using Gddresuce On Loop

I have a HDD that I was using as temporary storage (ext4) though I knew it was close to failing. Upon retrieval of the data, I found some of it was corrupted.

I unmounted and ran gddrescue on the whole device (/dev/sdd) using this command:

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The image took ~24 hours to complete, and I can mount it using:

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Of course, some of the files are still slightly corrupted, so I would like to fsck on the image to try and correct anything that can be. However, when trying this on the image, I get:

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Here are some other interesting pieces of info:

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gpart finds no useful info it seems, and trying to fsck using the -b option and the backups suggested by mke2fs results in the message above or (using a very high block):

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As I said, the image can be mounted and the filesystem accessed. Many of the files seem ok and can be directly copied off of the mount, but I'd like see if some can be recovered or at the very least copy everything off the image, skipping the corrupted files (perhaps with a log of those skipped).

None of the data is critical and will be ok if lost, but I'd still like to try recovering it just as a proof of concept. The original disk can still be used (very slowly), but I'd rather recover the data only using the image if possible.