Some rapid work with a German dictionary and looking at the titles on the file covers unearths that the documents are the records of an SS research unit (well research may be generous as the thing that caused the SAN loss was a set of photos of some of the research).
Basically you can identify the following threads of research:
In particular it appears that a lot of the 'research' was done using concentration camp inmates and usually the 'test subjects' had a very low survival rate. In some cases it appears that they sometimes were reanimated after they were killed, at least judging by the photos you saw. One thing that did strike you as significant was that one of the sets of photos was of a ritual to grant Longevity Ritual (as far as your crap translation skills can tell). The ritual involved the cutting out of a heart and its consumption.
There were also a number of journals (in German, although there was one in ancient English and two in Latin). There were also three books in what looks like Latin. There was obviously a printing press as a number of the books are in the same imprint.