I don't know if Dark Waters has it, but it could very well be a huntin' dog come lookin' fer you:
Fido
It is recommended that once you get down below 30m, possibly combining the dive with a change of direction once submerged, that you go quiet, especially if you hear a torpedo whine... I do not remember if lurker_hlb3 brought Rubini's Fido into the original OM mod or not...