that broken pipe/hiss is real PITA.
you pick it up whenever you take any damage...it is not activated on control room damage.
then it hangs around even after your crew repairs all damage.
you can be on high TC (2048) and still hear it.
you can save and exit then re-enter and reload and still hear it.
you come out of high TC for a radar contact or radio message and you hear it and then you accelerate to high TC and it is suddenly quiet.
then six days later for no reason at all, the hiss returns. WTF.
no consistency whatsoever.
exasperating.
i suspect the sound is Interior.SteamBurst and it is set to loop. it would be interesting to find out what event activates it.
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there are only two things in the world: submarines and targets.
Fortis et stabilis et fidelis, semper
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Silent Hunter 4 1.5 Gold Edition on CDROM
LAA enabled
Dell XPS with 32 GB Ram running Win10