Originally the topic was undersea exploration. There’s no need for steganography, the issue is signal strength, not obscuring communications. There isn’t an enemy to intercept these messages.
I didnt realize that - I was just trying to convey, that mayhaps ; If a secrete message would be sent via Sonar, an image encoding might be efficient, such that the blok of info one wishes to convey, might be a really long stream, as opposed to encoded into an image which would result in shorter sonic comms...
