Two options on this. 1) I stay where I fell with my crew mates. 2) My body be recovered and repatriated to my family or buried in a military cemetery. Having some tourist moving remains around for whatever reason isn't on the list. I can't imagine that anyone would approve of an American war grave being exhumed because some farmer thought the body would be better suited on the other side of road. The German Gov't knows where the sub is. The identity of who those men are is well documented. If they wanted the men buried in Germany, I could certainly see them removing them.
When exploring a wreck, human remains need to be respected. If I were a sailor on the Black Point I would expect to have all our graves respected.....
Thoughtless divers taking bones was mentioned in "Shadow Divers" but I don't know how widespread the problem is. Taking artifacts is also problematic, but there is a big difference between taking a plate and taking a man's watch and taking his femur.
My Father, a Naval Academy Graduate, would have disowned me if he found out I touched a war grave. It would have been one of a very few things that would have truly upset him.
You did say "Nazi sailors." They weren't, most of them were hoping to survive the war and go home. With a casualty rate of 70% at this late stage of the war, no one expected Germany to win and they knew they were going out on a suicide mission, all the sadder...
I haven't dove the sub, yet. I was supposed to go on it in the 1980's but the conditions on put us on an alternate dive site, so I missed out. Is the moving of remains inside the sub, away from the hatches and battle damage a common practice? Has anyone else heard of this?
https://www.usnwc.edu/About/News/November-2014/Naval-War-College-Honors-Fallen-German-Sailors.aspx
---------- Post added May 31st, 2015 at 10:00 PM ----------
Most subs at the end of the war made decisions about surrender in an open manner. Surrender to a allied ship or port or head for a neutral country. This was the only one that kept fighting. It is possible that Fromsdorf decided (unilaterally) to commit "suicide by cop." A number of Germans (and Japanese) killed themselves at the end of the war. But it certainly wasn't a huge number. I can't imagine that this boat crew took a vote and decided to take one for the Fuhrer... I could see a the two or three officers NCOs who new the war ended deciding to lie to the rest of the crew, but that late in the game I doubt they would...