Not sure if it unreal, it was discused many times ...
The ping is directional, so, the sonar man can hear if all ping are directed to the sub, or if the DDs is sweaping with the ping, if you receive a series of ping on the hull the sonar man can asure you are pinged and detected.
I am not sure, but the we are being detected sentence is due to the active sonar instead the pasive one, the fact you can not to hear the Dds pings not means it is not pinging you.
It is because the range at wich the sounds are audibble are not in concordance with the range at wich the DDs are pinging you.
DDs can pinging you so far of the point at wich you start up to hear the pinging sound.
Why for....? Because the files wich control both ranges are diferent files, and may be to save computer resources, because if you can hear all the sounds at one time at correct range, may be we need a P VI instead a P IV :rotfl:
Some body comment time ago in SH2 disusion, when the ping hit the hull there was a extrange sound inside the sub, wich ensure you was hit by the ping, some like poatoes frying by a fraction of second. :hmm: Not sure.
