Why do we expect the DDs to use only passive hydrophone while running a search pattern?
Me as a DD captain I would have ordered to run an active ASDIC search just right into the blue from time to time.
I think it is quite realistic to be pinged occasionally sitting close to a DD on duty. Keep your aspect low and hope you'll make it into the convoy.
In later war I stay outside the convoy and make full use of my pattern running torpedo stand off capabilities.
