Accidentally Erased Hard Drive...

Posting for a friend - although I've also done this in the past:

I meant to run First Aid on a client's internal drive, while booted from a different drive, but instead I accidentally erased the internal drive (!!!).

I have Data Rescue, and am running the Deleted Files scan now. But from my understanding, it does not recover any of the original directory structure or filenames.

I have not written any data to it - the only thing I've done since the erasure is initiated the Deleted Files scan.

Do I have any options for restoring the client's machine to its pre-erased state?