Anyone have any ideas on how to recover data form a wiped drive?

I inadvertently shredded the wrong drive.  Instead of using /dev/sdb,
which refers to my external USB drive, I used /dev/sda, which is my
internal drive.  Here are what the last few lines from the shred look
like as well as the output from an od:

# shred -v -n 0 -z /dev/sda
...
shred: /dev/sda: pass 1/1 (000000)...73GiB/75GiB 97%
shred: /dev/sda: pass 1/1 (000000)...74GiB/75GiB 99%
shred: /dev/sda: pass 1/1 (000000)...75GiB/75GiB 100%
# od -bc /dev/sda
0000000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000
         \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0  \0
*
1124174260000
#

Nothing but a bunch of zeros.  Notice this isn't just a partition.
It's the entire drive.  So, the partition table, all the partitions,
all the extended partitions, swap space, and all filesystems are no
longer visible.

Is this data pretty much gone, or is there some "low-level" stuff that
I can do to get back the data, even just a few files?

Regards,
- Robert

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