The HDD failed with the full disk encryption, so it is lost as a file.
1. What do you mean by failed? Bad sector, error when it's mounted, fall from high height?
2. If you remember the password or has encryption key, usually it's possible to recover your file. Although usually it require paid software or some technical knowledge.
I asked the same question above, if he manage to recover the drive, no need to worry about btcrecover.