It's been a while, but I seem to recall in SH3 that, after you passed a certain depth, sonar became useless, both for the escorts and for you. I'm not sure where that line was...something like 400 or 500 meters...something like that, but everyone went deaf. Plus at least you could run at flank and maintain your depth.
In SH4 the effect somehow seems sooner (like others have said, since the devs thought the max depth of US boats was 450, why model all the way down to 200 or 300 meters?). In addition, if you get deep enough (past 200 meters, if playing OM and diving in a VIIC/41), flank speed won't necessarily keep you from still being sucked down. A blow ballast may be your only hope.
It's really a nutty effect that I hope is resolved someday on either SH4 or 5.
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