Deep cracks in dams or bridges are "red-line" safety issues.
Developed within the academic community, including projects associated with CNRS and Université de Liège, Hyperdeep is a legitimate tool with a specific, non-commercial purpose. A "crack" in this context would refer to a pirated, illegitimate copy of this academic software, which is likely an obscure but real target for certain piracy groups.
The "crack" typically involves a or Brute-Force Attack on the encryption key used by DeepSound. Unlike modern encryption standards (like AES-256) which are computationally expensive to crack, older or proprietary steganography implementations often use weak key derivation functions.