Hi guys,
Some details about the sawfish colour can be found in my downloadable article "U 96 and the Laughing Sawfish" at the AMP library section -
http://amp.rokket.biz/reference.shtml
You'll find your answer to the free-flooding hole question in my article "Type VIIC Free-Flooding Vent Patterns" which can also be found at the same place.
Cheers,
Dougie