Willkommen, Capt. Guitar!
Re the hydrophone upgrade, go for it, definitely. I've not noticed any greater vulnerability to wabo damage (yet). And your crew can repair stuff like that if it breaks. One detail: you'll be hearing ships as far as 30 nm away, so you'll have to take that into account when intercepting long-range contacts.
Mach's gut!
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Dietrich Schöneboom, U-431
"Es wird klappen, Herr Kaleun. Ganz sicher."
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