
For anyone interested in a rather technical paper on (primarily) German WW2 hydrophone tech, here’s a paper I stumbled across when looking into these gadgets.
— Von Due
Some hardly known aspects of the GHG, the U-boat’s group listening
apparatus

For anyone interested in a rather technical paper on (primarily) German WW2 hydrophone tech, here’s a paper I stumbled across when looking into these gadgets.
— Von Due
Some hardly known aspects of the GHG, the U-boat’s group listening
apparatus