For more realisim go to the below link under Authentic Photographs tab and you will see over 250 photos of U-boats and their crew, Chances are that your U-Boat will be there and is downloadable and printable. While your in that carreer you will have a photo of the actual boat and crew.
Wenn es mehr Waffen, dann laufen wie die Hölle
http://silent-hunter-addict.com