Seeking information about SS Ancona

I am researching the Italian immigrant ship Ancona which was torpedoed in Nov 1915.  I have found plenty of newspaper articles and know a lot about it.  I am looking for the manifest that lists all the passengers.  I believe my grandmother and her family survived that sinking.  It never made it to the U.S. so the manifest is not contained in other databases for those that arrived at Ellis Island.  Any ideas?  Thanks.