Good luck and good hunting!
A single German newspaper source claims that during a manoeuvre the U 24 passed the anti-submarine escorts of the USS Enterprise undetected, fired a simulated torpedo salvo, took a periscope foto (below) and then popped up near the carrier which made the US Admiral very angry. Arrh.
Can anyone confirm this story?
http://www.abendblatt.de/daten/2007/08/08/779801.html
Another incident: U 18 periscope shot of a carrier; video claims that it costed an US Vice Admiral his job and that picture was kept secret for 10 years (1:50 min, G)
Please post some pics.