When does the war end?
 

I've set out from Guam, date is 9 Aug 1945. I guess this will be the last war patrol of the USS Tench. Got a radio message about the Nagasaki bomb. Just wondering how many days I have until war's end.

Been a while but if I recall sim will end at noon on the 15 Aug.

Yup, 15 Aug it is. But the ending's kind of abrupt. I was expecting a radio message saying hostilities are over, return to base etc etc.
Is there only one ending? The blurb I got was basically taking up a desk job (finally) then becoming a wealthy industrialist and writing memoirs.

Yes, that is it. Unfortunately, like many aspects of the sim, devs were quite lazy with the ending. If was not a hard coded thing, would change it.