I guess the sound might be very characteristic because variations in the process of generation might be limited (amount of energy delivered / type of particle c

I guess the sound might be very characteristic because variations in the process of generation might be limited (amount of energy delivered / type of particle created?) and I would expect it to sound a lot like a sharp "ping" if I had to take a guess. Temperature, salinity and currents would affect propagation and dispersion but deep enough in the sea there might be a stable enough environment to be able account for that. A very interesting idea at least!