WWI submarine flotilla organization, August 1914.
Not to clutter forum thread with text pics I'm posting a link (let me know if it doesn't work). Also, I'm not sure if you still need this but it is still listed in requirements on the first page.
It's in Croatian in case you need google translate for certain words here and there but its just a straight forward list for all major nations.
https://imgur.com/a/mEmi1AQ