I forgot about one more thing, here (http://www.uboatarchive.net/U-177INT.htm)
is available interrogation report of survivors from U-177.
U-177 was type IXD2 boat, laid down two years before U-864.
Here is the drawing of the machine rooms, where you can see two diesel compressors.
[www.uboatarchive.net]

Of course, as it is report from interrogation, it should be read with some distrust, but
I think, that it confirms assumption, that U-864 was fitted with Junkers compressor.

--
Regards
Maciek


[www.tvre.org]