Are you looking for information on the training U-Boat crews received, or just general 'life in the U-Boat' info?

Primary materials like training manuals, crew memoirs/accounts, and other shipboard life are very hard to find, especially with those of us with less professional access to databases or records. A lot of that material remains untranslated as well. It's one of the most frustrating parts of researching into World War One's U-Boat campaigns (definitely less published than it's Second War descendants).

I'll try to find what I can to help, sorry!