Very cool!
This kind of story adds immersion, and you also learn history at the same time!
A good thing would be to create some captains (real or imaginary) who tell stories about their war patrols (and not just random names). You could meet them again later in the war, and some of them would disappear (KIA, muted to another sector, or to a u-boat school to teach new recruits... or promoted to the BDU staff).