I started a career in Bergen in '45 once just for the Heck of it, and an air raid started
instantly once I entered the first patrol. I mean,
right after the "Not so long ago..."-initialization sequence. The British sent a fligth of bombers over the city, sinking several ships. I was safe in the stupid sub pen that never existed in reality (I should know, it's my damned hometown)
.
I always wondered what'd happen if a port suddenly went hostile with you in it between missions.