I would close a research running from a couple of years about the Balkan wreck's position , sunk by UB-48 off the coast of Calvi (Corsica ) on 08/16/1918 .
Some say it's about 7/8 mg from Calvì , others from Ile Rousse .
The nautical chart marks it at 3 mg from shore , but I think it is the position where the survivors were found , after a night adrift.
If the KTB show a position of attack , we could close the investigation, since the Balkan sank immediately by explosion of boilers .