Check this thread:
http://www.subsim.com/radioroom/showthread.php?t=110620
There is a renown chart you can d/l. It doesn't include the values for injured crew but does say a Friendly ship is worth minus points. Is it possible maybe in the dark you downed a friendly ship? A Europea liner would be 900 points, but I don't think the Allies used them. Only ask this because the other day I was ready to attack a Task Force and it was pitch black out. Had a very hard time seeing, and wasn't until I got real close I saw USA flags. I've also found USA merchants where I had been downing Tankers and Freighters like a shooting gallery, don't know why he was even in that area, especially alone.
I wouldn't have expected to see either one where I did, just a suggestion. But it was probably the injured crew, maybe the worse the injury the more the points???
As for the sinking of the photographed ship, I think the Admiral would ask, "Pretty pictures boy, but did you sink the damn things?"
The other posibility, were you drunk at the local bar and bought rounds for the whole fleet? And then forgot?
Peabody