Some of that footage is on a DVD I have 'Battle of the Atlantic' by Karl Heinz Geiger, an AV Media production from 1991 (DVD is 2006 Boulevard Entertainment) which comprises mostly WW2 German documentary footage. It's all B&W on the DVD I have, so I guess it was hand tinted at a much later date. Worth having if you can find it, I paid the princely sum of 1.99 for it in Sainsburys.
Chock