Finchou, you should try to delete TDW_Ship_Inertia_1_1_0 and start over a new career.
I had problem with it (and not alone) at first, and strangely it messed up my hydrophone.
Then without it, it worked great, and then i reactivated it at the end of my list for other career... without issue

Don't know why it was affecting hydrophone cause no files overwriten though...but fact was there.
Since i play with REM, i didn't put it back yet.
EDIT: just made a test with my list, and ANYTIME ANYWHERE i activate ship inertia now, can't hear a damn thing in hydrophone!
Back without it, works nice again...