If you are using time compression on the surface and in a storm your - Watch Officer is to blame not your hydrophone operator - he (hydrophone) cannot hear or detect over the sound of your diesels...hydrophone is passive and listen for sound - sonar is active signal (the ping) sent by a vessel the time it takes to return is the estimate of distance - many better experts here on the subject but in general its not your sonar/hydrophone fault if you are surfaced and running any time compression...
Yes once dead unless you make saves in game it is time to return to the Academy Herr Kaleun.
